| 1988 | ATL | Atlanta Braves | MLB-NL | MLB | team page | 160 | 54 | 106 | 39.5 | 555 | 741 | -186 | 6 | 12 | Russ Nixon, Chuck Tanner | Atlanta-Fulton County Stadium | dnq |
| 1988 | ATL | Richmond Braves | IL | AAA | team page | 141 | 66 | 75 | 11.0 | 534 | 525 | 9 | 2 | 4 | Jim Beauchamp | The Diamond | dnq |
| 1988 | ATL | Greenville Braves | Sou | AA | team page | 144 | 87 | 57 | -- | 638 | 522 | 116 | 1 | 1 | Buddy Bailey, Russ Nixon | Greenville Municipal Stadium | Lost in Finals |
| 1988 | ATL | Durham Bulls | Caro | A+ | team page | 140 | 82 | 58 | 6.0 | 716 | 598 | 118 | 2 | 2 | Buddy Bailey, Grady Little | Durham Athletic Park | dnq |
| 1988 | ATL | Burlington Braves | Midw | A | team page | 140 | 60 | 80 | 27.0 | 603 | 743 | -140 | 6 | 11 | Rick Albert, Grady Little | Community Field | dnq |
| 1988 | ATL | Sumter Braves | SAL | A | team page | 137 | 64 | 73 | 20.5 | 516 | 656 | -140 | 6 | 8 | Ned Yost | Riley Park | dnq |
| 1988 | ATL | Gulf Coast Braves | GCL | Rk | team page | 63 | 16 | 47 | 29.0 | 193 | 327 | -134 | 8 | 12 | Pedro Gonzalez | West Palm Beach Municipal Stadium | dnq |
| 1988 | ATL | Idaho Falls Braves | Pio | Rk | team page | 70 | 28 | 42 | 16.0 | 400 | 503 | -103 | 3 | 6 | Jim Procopio | McDermott Field | dnq |
| 1988 | ATL | Pulaski Braves | App | Rk | team page | 70 | 35 | 35 | 2.0 | 368 | 331 | 37 | 2 | 5 | Cloyd Boyer | Calfee Park | dnq |
| 1988 | BAL | Baltimore Orioles | MLB-AL | MLB | team page | 161 | 54 | 107 | 34.5 | 550 | 789 | -239 | 7 | 14 | Frank Robinson, Cal Ripken | Memorial Stadium | dnq |
| 1988 | BAL | Rochester Red Wings | IL | AAA | team page | 141 | 77 | 64 | -- | 561 | 540 | 21 | 1 | 2 | Johnny Oates | Silver Stadium | League Champions (Tidewater) |
| 1988 | BAL | Charlotte Knights | Sou | AA | team page | 144 | 69 | 75 | 18.0 | 601 | 637 | -36 | 2 | 7 | Greg Biagini | Crockett Park | dnq |
| 1988 | BAL | Hagerstown Suns | Caro | A+ | team page | 140 | 79 | 61 | -- | 652 | 473 | 179 | 1 | 3 | Mike Hart | Municipal Stadium | dnq |
| 1988 | BAL | Erie Orioles | NYPL | A- | team page | 77 | 46 | 31 | 1.5 | 370 | 268 | 102 | 2 | 4 | Bobby Tolan | Ainsworth Field | dnq |
| 1988 | BAL | Bluefield Orioles | App | Rk | team page | 71 | 24 | 47 | 13.5 | 331 | 443 | -112 | 5 | 10 | Glenn Gulliver | Bowen Field at Peters Park | dnq |
| 1988 | BOS | Boston Red Sox | MLB-AL | MLB | team page | 162 | 89 | 73 | -- | 813 | 689 | 124 | 1 | 3 | John McNamara, Joe Morgan | Fenway Park | Lost ALCS (Athletics) |
| 1988 | BOS | Pawtucket Red Sox | IL | AAA | team page | 142 | 63 | 79 | 14.5 | 519 | 557 | -38 | 3 | 6 | Edward Nottle | McCoy Stadium | dnq |
| 1988 | BOS | New Britain Red Sox | East | AA | team page | 137 | 47 | 90 | 33.0 | 430 | 542 | -112 | 8 | 8 | Dave Holt | Beehive Field | dnq |
| 1988 | BOS | Lynchburg Red Sox | Caro | A+ | team page | 140 | 68 | 72 | 11.0 | 689 | 660 | 29 | 3 | 6 | Dick Berardino | Lynchburg City Stadium | Lost in Finals (Kinston) |
| 1988 | BOS | Winter Haven Red Sox | FSL | A+ | team page | 139 | 45 | 94 | 39.0 | 455 | 773 | -318 | 4 | 14 | Doug Camilli | Chain of Lakes Park | dnq |
| 1988 | BOS | Elmira Pioneers | NYPL | A- | team page | 76 | 28 | 48 | 20.0 | 258 | 372 | -114 | 6 | 11 | Bill Limoncelli | Dunn Field | dnq |
| 1988 | CAL | California Angels | MLB-AL | MLB | team page | 162 | 75 | 87 | 29.0 | 714 | 771 | -57 | 4 | 10 | Cookie Rojas, Moose Stubing | Anaheim Stadium | dnq |
| 1988 | CAL | Edmonton Trappers | PCL | AAA | team page | 141 | 61 | 80 | 23.5 | 712 | 687 | 25 | 5 | 9 | Tom Kotchman | John Ducey Park | dnq |
| 1988 | CAL | Midland Angels | Tex | AA | team page | 135 | 61 | 74 | 13.5 | 727 | 780 | -53 | 3 | 6 | Max Oliveras | Angels Stadium | dnq |
| 1988 | CAL | Palm Springs Angels | Calif | A+ | team page | 142 | 70 | 72 | 15.0 | 769 | 728 | 41 | 5 | 7 | Bill Lachemann | Palm Springs Stadium | Lost in Semi-Finals |
| 1988 | CAL | Quad Cities Angels | Midw | A | team page | 139 | 60 | 79 | 26.5 | 517 | 624 | -107 | 7 | 10 | Eduardo Rodriguez | John O'Donnell Stadium | dnq |
| 1988 | CAL | Bend Bucks | Nwst | A- | team page | 76 | 38 | 38 | 8.0 | 328 | 349 | -21 | 3 | 6 | Don Long | Vince Genna Stadium | dnq |
| 1988 | CHN | Chicago Cubs | MLB-NL | MLB | team page | 162 | 77 | 85 | 24.0 | 660 | 694 | -34 | 4 | 9 | Don Zimmer | Wrigley Field | dnq |
| 1988 | CHN | Iowa Cubs | Amer | AAA | team page | 142 | 78 | 64 | 3.0 | 669 | 602 | 67 | 2 | 3 | Pete Mackanin | Sec Taylor Stadium | dnq |
| 1988 | CHN | Pittsfield Cubs | East | AA | team page | 138 | 75 | 63 | 5.5 | 557 | 500 | 57 | 3 | 3 | Jim Essian | Wahconah Park | Lost in Semi-Finals |
| 1988 | CHN | Winston-Salem Spirits | Caro | A+ | team page | 140 | 73 | 67 | 15.0 | 640 | 600 | 40 | 3 | 5 | Jay Loviglio | Ernie Shore Field | dnq |
| 1988 | CHN | Charleston (Wv) Wheelers | SAL | A | team page | 137 | 51 | 86 | 27.0 | 413 | 576 | -163 | 5 | 11 | Brad Mills | Walt Powell Park | dnq |
| 1988 | CHN | Peoria Chiefs | Midw | A | team page | 140 | 70 | 70 | 17.0 | 519 | 513 | 6 | 5 | 7 | Jim Tracy | Meinen Field | dnq |
| 1988 | CHN | Geneva Cubs | NYPL | A- | team page | 78 | 27 | 51 | 21.0 | 272 | 353 | -81 | 5 | 12 | Bill Hayes | McDonough Park | dnq |
| 1988 | CHN | Wytheville Cubs | App | Rk | team page | 69 | 29 | 40 | 16.0 | 365 | 435 | -70 | 5 | 8 | Steve Roadcap | Withers Field | dnq |
| 1988 | CHA | Chicago White Sox | MLB-AL | MLB | team page | 161 | 71 | 90 | 32.5 | 631 | 757 | -126 | 5 | 11 | Jim Fregosi | Comiskey Park | dnq |
| 1988 | CHA | Vancouver Canadians | PCL | AAA | team page | 142 | 85 | 57 | -- | 661 | 573 | 88 | 1 | 2 | Terry Bevington | Nat Bailey Stadium | Lost in Finals |
| 1988 | CHA | Birmingham Barons | Sou | AA | team page | 144 | 62 | 82 | 19.5 | 612 | 654 | -42 | 4 | 9 | Rico Petrocelli | Hoover Metropolitan Stadium | dnq |
| 1988 | CHA | Tampa White Sox | FSL | A+ | team page | 130 | 71 | 59 | 3.5 | 521 | 485 | 36 | 2 | 5 | Marv Foley | Al Lopez Field | Lost in Semi-Finals |
| 1988 | CHA | South Bend White Sox | Midw | A | team page | 140 | 59 | 81 | 25.0 | 574 | 667 | -93 | 5 | 12 | Steve Dillard | Stanley Covelski Regional Stadium | dnq |
| 1988 | CHA | Utica Blue Sox | NYPL | A- | team page | 76 | 47 | 29 | 1.0 | 414 | 352 | 62 | 2 | 2 | Richard Patterson | Donovan Stadium at Murnane Field | dnq |
| 1988 | CHA | Gulf Coast White Sox | GCL | Rk | team page | 63 | 42 | 21 | 3.0 | 317 | 247 | 70 | 3 | 3 | Art Kusnyer | Payne Park | dnq |
| 1988 | CIN | Cincinnati Reds | MLB-NL | MLB | team page | 161 | 87 | 74 | 7.0 | 641 | 596 | 45 | 2 | 3 | Pete Rose, Tommy Helms | Riverfront Stadium | dnq |
| 1988 | CIN | Nashville Sounds | Amer | AAA | team page | 142 | 73 | 69 | 16.0 | 480 | 587 | -107 | 2 | 4 | Jack Lind | Herschel Greer Stadium | dnq |
| 1988 | CIN | Chattanooga Lookouts | Sou | AA | team page | 143 | 81 | 62 | -- | 586 | 485 | 101 | 1 | 2 | Tom Runnells | Engel Stadium | League Champions |
| 1988 | CIN | Cedar Rapids Reds | Midw | A | team page | 140 | 87 | 53 | -- | 677 | 493 | 184 | 1 | 1 | Marc Bombard | Veterans Field | League Champions |
| 1988 | CIN | Greensboro Hornets | SAL | A | team page | 139 | 79 | 60 | -- | 553 | 491 | 62 | 1 | 3 | Dave Miley | World War Memorial Stadium | Lost in Semi-Finals |
| 1988 | CIN | Billings Mustangs | Pio | Rk | team page | 69 | 35 | 34 | 17.0 | 402 | 399 | 3 | 3 | 5 | Dave Keller | Cobb Field | dnq |
| 1988 | CIN | Gulf Coast Reds | GCL | Rk | team page | 63 | 21 | 42 | 18.0 | 241 | 345 | -104 | 4 | 10 | Sam Mejias | Plant City Stadium | dnq |
| 1988 | CLE | Cleveland Indians | MLB-AL | MLB | team page | 162 | 78 | 84 | 11.0 | 666 | 731 | -65 | 6 | 9 | Doc Edwards | Cleveland Stadium | dnq |
| 1988 | CLE | Colorado Springs Sky Sox | PCL | AAA | team page | 139 | 62 | 77 | 22.5 | 689 | 830 | -141 | 5 | 8 | Steve Swisher | Sky Sox Stadium | dnq |
| 1988 | CLE | Williamsport Bills | East | AA | team page | 139 | 66 | 73 | 15.0 | 505 | 572 | -67 | 6 | 6 | Mike Hargrove | Bowman Field | dnq |
| 1988 | CLE | Kinston Indians | Caro | A+ | team page | 140 | 88 | 52 | -- | 721 | 541 | 180 | 1 | 1 | Glenn Adams | Grainger Stadium | League Champions (Lynchburg) |
| 1988 | CLE | Waterloo Indians | Midw | A | team page | 140 | 78 | 62 | 9.0 | 634 | 554 | 80 | 4 | 5 | Ken Bolek | Municipal Stadium | dnq |
| 1988 | CLE | Burlington Indians | App | Rk | team page | 70 | 37 | 33 | -- | 322 | 283 | 39 | 1 | 4 | Mike Bucci | Burlington Athletic Stadium | Lost in Finals |
| 1988 | CLE | Gulf Coast Indians | GCL | Rk | team page | 63 | 38 | 25 | 1.0 | 345 | 281 | 64 | 2 | 5 | Billy Williams | Baseball City | dnq |
| 1988 | DET | Detroit Tigers | MLB-AL | MLB | team page | 162 | 88 | 74 | 1.0 | 703 | 658 | 45 | 2 | 4 | Sparky Anderson | Tiger Stadium | dnq |
| 1988 | DET | Toledo Mud Hens | IL | AAA | team page | 142 | 58 | 84 | 19.5 | 433 | 511 | -78 | 4 | 8 | Pat Corrales | Ned Skeldon Stadium | dnq |
| 1988 | DET | Glens Falls Tigers | East | AA | team page | 137 | 80 | 57 | -- | 660 | 518 | 142 | 1 | 1 | John Wockenfuss | East Field Stadium | Lost in Semi-Finals |
| 1988 | DET | Lakeland Tigers | FSL | A+ | team page | 138 | 77 | 61 | 6.5 | 619 | 497 | 122 | 3 | 3 | Johnny Lipon | Joker Marchant Stadium | Lost in 1st Round |
| 1988 | DET | Fayetteville Generals | SAL | A | team page | 135 | 62 | 73 | 15.0 | 493 | 515 | -22 | 4 | 10 | Leon Roberts | J.P. Riddle Stadium | dnq |
| 1988 | DET | Bristol Tigers | App | Rk | team page | 73 | 46 | 27 | 1.0 | 456 | 311 | 145 | 2 | 2 | Rick Magnante | Devault Memorial Stadium | Lost in 1-game playoff |
| 1988 | HOU | Houston Astros | MLB-NL | MLB | team page | 162 | 82 | 80 | 12.5 | 617 | 631 | -14 | 5 | 7 | Hal Lanier | Astrodome | dnq |
| 1988 | HOU | Tucson Toros | PCL | AAA | team page | 143 | 68 | 75 | 18.5 | 702 | 708 | -6 | 3 | 6 | Bob Didier | Hi Corbett Field | dnq |
| 1988 | HOU | Columbus Astros | Sou | AA | team page | 143 | 69 | 74 | 17.5 | 594 | 594 | 0 | 3 | 6 | Tom Wiedenbauer | Golden Park | dnq |
| 1988 | HOU | Osceola Astros | FSL | A+ | team page | 137 | 83 | 54 | -- | 622 | 495 | 127 | 1 | 1 | Keith Bodie | Osceola County Stadium | Lost in Finals |
| 1988 | HOU | Asheville Tourists | SAL | A | team page | 140 | 65 | 75 | 14.5 | 632 | 644 | -12 | 3 | 9 | Jim Coveney, Gary Tuck | McCormick Field | dnq |
| 1988 | HOU | Auburn Astros | NYPL | A- | team page | 75 | 42 | 33 | 5.5 | 427 | 368 | 59 | 3 | 5 | Frank Cacciatore | Falcon Park | dnq |
| 1988 | HOU | Gulf Coast Astros | GCL | Rk | team page | 63 | 28 | 35 | 11.0 | 253 | 259 | -6 | 3 | 7 | Julio Linares | Kissimmee | dnq |
| 1988 | KCA | Kansas City Royals | MLB-AL | MLB | team page | 161 | 84 | 77 | 19.5 | 704 | 648 | 56 | 3 | 8 | John Wathan | Royals Stadium | dnq |
| 1988 | KCA | Omaha Royals | Amer | AAA | team page | 142 | 81 | 61 | -- | 631 | 524 | 107 | 1 | 2 | Glenn Ezell | Johnny Rosenblatt Stadium | Lost in Finals |
| 1988 | KCA | Memphis Chicks | Sou | AA | team page | 143 | 79 | 64 | 2.0 | 618 | 581 | 37 | 2 | 3 | Sal Rende | Tim McCarver Stadium | Lost in Semi-Finals |
| 1988 | KCA | Baseball City Royals | FSL | A+ | team page | 139 | 79 | 60 | 5.0 | 557 | 545 | 12 | 2 | 2 | Luis Silverio | Baseball City Stadium | dnq |
| 1988 | KCA | Appleton Foxes | Midw | A | team page | 140 | 58 | 82 | 26.0 | 585 | 661 | -76 | 6 | 13 | Brian Poldberg | Goodland Field | dnq |
| 1988 | KCA | Eugene Emeralds | Nwst | A- | team page | 76 | 38 | 38 | 8.0 | 340 | 358 | -18 | 4 | 5 | Paul Kirsch | Civic Stadium | dnq |
| 1988 | KCA | Gulf Coast Royals | GCL | Rk | team page | 63 | 39 | 24 | -- | 301 | 256 | 45 | 1 | 4 | Carlos Tosca | Baseball City Stadium | Lost in Finals |
| 1988 | LAN | Los Angeles Dodgers | MLB-NL | MLB | team page | 161 | 94 | 67 | -- | 628 | 544 | 84 | 1 | 2 | Tommy Lasorda | Dodger Stadium | Won World Series (Athletics) |
| 1988 | LAN | Albuquerque Dukes | PCL | AAA | team page | 142 | 86 | 56 | -- | 794 | 579 | 215 | 1 | 1 | Terry Collins | Albuquerque Sports Stadium | Lost in Semi-Finals |
| 1988 | LAN | San Antonio Missions | Tex | AA | team page | 133 | 73 | 60 | 0.5 | 570 | 571 | -1 | 2 | 2 | Kevin Kennedy | V.J. Keefe Memorial Stadium | Lost in Semi-Finals |
| 1988 | LAN | Bakersfield Dodgers | Calif | A+ | team page | 142 | 71 | 71 | -- | 695 | 660 | 35 | 0 | 6 | Gary LaRocque | Sam Lynn Ballpark | dnq |
| 1988 | LAN | Vero Beach Dodgers | FSL | A+ | team page | 137 | 75 | 62 | -- | 585 | 482 | 103 | 1 | 4 | John Shoemaker | Holman Stadium | Lost in 1st Round |
| 1988 | LAN | Salem Dodgers | Nwst | A- | team page | 76 | 43 | 33 | 3.0 | 428 | 337 | 91 | 2 | 2 | Tom Beyers | Chemeketa Community College Field | dnq |
| 1988 | LAN | Great Falls Dodgers | Pio | Rk | team page | 69 | 52 | 17 | -- | 534 | 257 | 277 | 1 | 1 | Tim Johnson | Legion Field | League Champions |
| 1988 | LAN | Gulf Coast Dodgers | GCL | Rk | team page | 63 | 43 | 20 | 2.0 | 326 | 169 | 157 | 2 | 2 | Joe Alvarez | Holman Stadium | dnq |
| 1988 | MIL | Milwaukee Brewers | MLB-AL | MLB | team page | 162 | 87 | 75 | 2.0 | 682 | 616 | 66 | 4 | 6 | Tom Trebelhorn | County Stadium | dnq |
| 1988 | MIL | Denver Zephyrs | Amer | AAA | team page | 141 | 72 | 69 | 8.5 | 755 | 641 | 114 | 3 | 5 | Gene Dusan, Duffy Dyer | Mile High Stadium | dnq |
| 1988 | MIL | El Paso Diablos | Tex | AA | team page | 134 | 74 | 60 | -- | 839 | 767 | 72 | 1 | 1 | Dave Machemer | Dudley Field | Lost in Finals |
| 1988 | MIL | Stockton Ports | Calif | A+ | team page | 143 | 94 | 49 | -- | 833 | 549 | 284 | 1 | 1 | Dave Huppert | Billy Hebert Field | Lost in Finals |
| 1988 | MIL | Beloit Brewers | Midw | A | team page | 140 | 66 | 74 | 18.0 | 519 | 572 | -53 | 3 | 8 | Gomer Hodge | Harry C. Pohlman Field | dnq |
| 1988 | MIL | Arizona Brewers | Ariz | Rk | team page | 22 | 4 | 18 | 18.0 | 423 | 282 | 141 | 4 | 4 | Alex Taveras | Maryvale Baseball Park | dnq |
| 1988 | MIL | Helena Brewers | Pio | Rk | team page | 70 | 41 | 29 | 11.5 | 402 | 347 | 55 | 2 | 4 | Dusty Rhodes | Kindrick Field | dnq |
| 1988 | MIN | Minnesota Twins | MLB-AL | MLB | team page | 162 | 91 | 71 | 13.0 | 759 | 672 | 87 | 2 | 2 | Tom Kelly | Hubert H. Humphrey Metrodome | dnq |
| 1988 | MIN | Portland Beavers | PCL | AAA | team page | 142 | 76 | 66 | 9.0 | 580 | 643 | -63 | 2 | 3 | Jim Mahoney, Jim Shellenback | Civic Stadium | Lost in Semi-Finals |
| 1988 | MIN | Orlando Twins | Sou | AA | team page | 141 | 66 | 75 | 19.5 | 544 | 619 | -75 | 5 | 8 | Duane Gustavson | Tinker Field | dnq |
| 1988 | MIN | Visalia Oaks | Calif | A+ | team page | 142 | 80 | 62 | 5.0 | 795 | 690 | 105 | 2 | 4 | Scott Ullger | Recreation Park | dnq |
| 1988 | MIN | Kenosha Twins | Midw | A | team page | 140 | 81 | 59 | 3.0 | 680 | 566 | 114 | 2 | 4 | Ron Gardenhire | Simmons Field | Lost in Finals |
| 1988 | MIN | Elizabethton Twins | App | Rk | team page | 70 | 33 | 37 | 12.5 | 301 | 377 | -76 | 4 | 7 | Ray Smith | Joe O'Brien Field | dnq |
| 1988 | MON | Montreal Expos | MLB-NL | MLB | team page | 162 | 81 | 81 | 20.0 | 628 | 592 | 36 | 3 | 8 | Buck Rodgers | Olympic Stadium | dnq |
| 1988 | MON | Indianapolis Indians | Amer | AAA | team page | 142 | 89 | 53 | -- | 628 | 500 | 128 | 1 | 1 | Joe Sparks | Bush Stadium | League Champions |
| 1988 | MON | Jacksonville Expos | Sou | AA | team page | 142 | 69 | 73 | 17.0 | 604 | 648 | -44 | 4 | 5 | Tommy Thompson | Sam W. Wolfson Baseball Park | Lost in Semi-Finals |
| 1988 | MON | West Palm Beach Expos | FSL | A+ | team page | 134 | 71 | 63 | 2.5 | 586 | 432 | 154 | 3 | 7 | Felipe Alou | West Palm Beach Municipal Stadium | Lost in Semi-Finals |
| 1988 | MON | Rockford Expos | Midw | A | team page | 140 | 84 | 56 | -- | 682 | 544 | 138 | 1 | 2 | Alan Bannister | Marinelli Field | Lost in Semi-Finals |
| 1988 | MON | Jamestown Expos | NYPL | A- | team page | 76 | 47 | 29 | -- | 369 | 265 | 104 | 1 | 3 | Roger LaFrancois | College Stadium | Lost in Finals |
| 1988 | MON | Gulf Coast Expos | GCL | Rk | team page | 63 | 24 | 39 | 21.0 | 218 | 318 | -100 | 6 | 9 | Dave Jauss | McKechnie Field | dnq |
| 1988 | NYN | New York Mets | MLB-NL | MLB | team page | 160 | 100 | 60 | -- | 703 | 532 | 171 | 1 | 1 | Davey Johnson | Shea Stadium | Lost NLCS (Dodgers) |
| 1988 | NYN | Tidewater Tides | IL | AAA | team page | 141 | 77 | 64 | -- | 548 | 496 | 52 | 1 | 1 | Mike Cubbage | Met Park | Lost in Finals (Rochester) |
| 1988 | NYN | Jackson Mets | Tex | AA | team page | 136 | 61 | 75 | 13.0 | 525 | 552 | -27 | 4 | 7 | Tucker Ashford | Smith-Wills Stadium | dnq |
| 1988 | NYN | St. Lucie Mets | FSL | A+ | team page | 139 | 74 | 65 | 2.0 | 537 | 500 | 37 | 2 | 6 | Clint Hurdle | Thomas J. White Stadium | League Champions |
| 1988 | NYN | Columbia Mets | SAL | A | team page | 137 | 74 | 63 | 10.5 | 581 | 588 | -7 | 4 | 5 | Butch Hobson | Capital City Stadium | dnq |
| 1988 | NYN | Little Falls Mets | NYPL | A- | team page | 75 | 39 | 36 | 8.5 | 305 | 339 | -34 | 4 | 6 | Bill Stein | Little Falls Veterans Memorial Park | dnq |
| 1988 | NYN | Gulf Coast Mets | GCL | Rk | team page | 63 | 21 | 42 | 24.0 | 242 | 356 | -114 | 7 | 11 | John Tamargo | Thomas J. White Stadium | dnq |
| 1988 | NYN | Kingsport Mets | App | Rk | team page | 73 | 47 | 26 | -- | 434 | 301 | 133 | 1 | 1 | Bobby Floyd | Dobyns-Bennett | League Champions |
| 1988 | NYA | New York Yankees | MLB-AL | MLB | team page | 161 | 85 | 76 | 3.5 | 772 | 748 | 24 | 5 | 7 | Lou Piniella, Billy Martin | Yankee Stadium I | dnq |
| 1988 | NYA | Columbus Clippers | IL | AAA | team page | 142 | 65 | 77 | 12.5 | 498 | 548 | -50 | 3 | 5 | Bucky Dent | Cooper Stadium | dnq |
| 1988 | NYA | Albany/Colonie Yankees | East | AA | team page | 138 | 72 | 66 | 8.5 | 563 | 586 | -23 | 4 | 4 | Thomas Jones, Stump Merrill | Heritage Park | League Champions |
| 1988 | NYA | Fort Lauderdale Yankees | FSL | A+ | team page | 134 | 69 | 65 | 4.5 | 514 | 507 | 7 | 4 | 9 | Buck Showalter | Fort Lauderdale Stadium | dnq |
| 1988 | NYA | Prince William Yankees | Caro | A+ | team page | 139 | 55 | 84 | 23.5 | 604 | 723 | -119 | 4 | 7 | Wally Moon, Gene Tenace | G. Richard Pfitzner Stadium | dnq |
| 1988 | NYA | Oneonta Yankees | NYPL | A- | team page | 76 | 48 | 28 | -- | 387 | 294 | 93 | 1 | 1 | Gary Allenson | Damaschke Field | League Champions |
| 1988 | NYA | Gulf Coast Yankees | GCL | Rk | team page | 63 | 45 | 18 | -- | 323 | 202 | 121 | 1 | 1 | Brian Butterfield | Yankee Complex | League Champions |
| 1988 | OAK | Oakland Athletics | MLB-AL | MLB | team page | 162 | 104 | 58 | -- | 800 | 620 | 180 | 1 | 1 | Tony La Russa | Oakland-Alameda County Coliseum | Lost World Series (Dodgers) |
| 1988 | OAK | Tacoma Tigers | PCL | AAA | team page | 144 | 62 | 82 | 24.0 | 654 | 731 | -77 | 4 | 10 | Bradley Fischer | Cheney Stadium | dnq |
| 1988 | OAK | Huntsville Stars | Sou | AA | team page | 144 | 59 | 85 | 22.5 | 542 | 662 | -120 | 5 | 10 | Tommie Reynolds | Joe W. Davis Stadium | dnq |
| 1988 | OAK | Modesto A's | Calif | A+ | team page | 142 | 54 | 88 | 39.5 | 641 | 785 | -144 | 5 | 8 | Jeff Newman | John Thurman Field | dnq |
| 1988 | OAK | Madison Muskies | Midw | A | team page | 140 | 65 | 75 | 19.0 | 611 | 637 | -26 | 4 | 9 | Jim Nettles | Warner Park | dnq |
| 1988 | OAK | Southern Oregon A's | Nwst | A- | team page | 76 | 46 | 30 | -- | 391 | 343 | 48 | 1 | 1 | Lenn Sakata | Miles Field | Lost in Finals |
| 1988 | OAK | Arizona Athletics | Ariz | Rk | team page | 58 | 34 | 24 | -- | 392 | 326 | 66 | 1 | 1 | Dave Hudgens | Scottsdale Stadium | dnq |
| 1988 | PHI | Philadelphia Phillies | MLB-NL | MLB | team page | 161 | 65 | 96 | 35.5 | 597 | 734 | -137 | 6 | 11 | Lee Elia, John Vukovich | Veterans Stadium | dnq |
| 1988 | PHI | Maine Phillies | IL | AAA | team page | 142 | 62 | 80 | 15.5 | 541 | 628 | -87 | 4 | 7 | George Culver | The Ballpark | dnq |
| 1988 | PHI | Reading Phillies | East | AA | team page | 136 | 67 | 69 | 12.5 | 561 | 556 | 5 | 5 | 5 | Bill Dancy | Reading Municipal Memorial Stadium | dnq |
| 1988 | PHI | Clearwater Phillies | FSL | A+ | team page | 138 | 52 | 86 | 20.5 | 416 | 520 | -104 | 5 | 13 | Granny Hamner | Jack Russell Memorial Stadium | dnq |
| 1988 | PHI | Spartanburg Phillies | SAL | A | team page | 138 | 69 | 69 | 9.5 | 590 | 573 | 17 | 2 | 7 | Mel Roberts | Duncan Park | League Champions |
| 1988 | PHI | Batavia Clippers | NYPL | A- | team page | 75 | 31 | 44 | 15.5 | 314 | 394 | -80 | 4 | 9 | Don McCormack | Dwyer Stadium | dnq |
| 1988 | PHI | Martinsville Phillies | App | Rk | team page | 70 | 29 | 41 | 8.0 | 304 | 378 | -74 | 4 | 9 | Roly De Armas | Hooker Field | dnq |
| 1988 | PIT | Pittsburgh Pirates | MLB-NL | MLB | team page | 160 | 85 | 75 | 15.0 | 651 | 616 | 35 | 2 | 4 | Jim Leyland | Three Rivers Stadium | dnq |
| 1988 | PIT | Buffalo Bisons | Amer | AAA | team page | 142 | 72 | 70 | 17.0 | 585 | 523 | 62 | 3 | 6 | Rocky Bridges | Pilot Field | dnq |
| 1988 | PIT | Harrisburg Senators | East | AA | team page | 138 | 65 | 73 | 15.5 | 519 | 542 | -23 | 7 | 7 | Dave Trembley | Riverside Stadium | dnq |
| 1988 | PIT | Salem Buccaneers | Caro | A+ | team page | 139 | 73 | 66 | 5.5 | 706 | 707 | -1 | 2 | 4 | Jay Ward | Salem Municipal Stadium | Lost in Semi-Finals (Lynchburg) |
| 1988 | PIT | Augusta Pirates | SAL | A | team page | 138 | 78 | 60 | 7.0 | 644 | 528 | 116 | 3 | 4 | Jeff Cox, Woody Huyke | Heaton Stadium | dnq |
| 1988 | PIT | Watertown Pirates | NYPL | A- | team page | 74 | 35 | 39 | 12.0 | 348 | 352 | -4 | 5 | 8 | Stan Cliburn | Duffy Fairgrounds | dnq |
| 1988 | PIT | Gulf Coast Pirates | GCL | Rk | team page | 63 | 26 | 37 | 19.0 | 222 | 269 | -47 | 5 | 8 | Julio Garcia | Pirate City Stadium | dnq |
| 1988 | PIT | Princeton Pirates | App | Rk | team page | 70 | 33 | 37 | 4.0 | 330 | 400 | -70 | 3 | 6 | Jim Thrift | H.P. Hunnicut Field | dnq |
| 1988 | SDN | San Diego Padres | MLB-NL | MLB | team page | 161 | 83 | 78 | 11.0 | 594 | 583 | 11 | 3 | 5 | Jack McKeon, Larry Bowa | Jack Murphy Stadium | dnq |
| 1988 | SDN | Las Vegas Stars | PCL | AAA | team page | 140 | 74 | 66 | 11.0 | 795 | 758 | 37 | 2 | 4 | Steve Smith | Cashman Field | League Champions |
| 1988 | SDN | Wichita Pilots | Tex | AA | team page | 136 | 60 | 76 | 15.0 | 662 | 671 | -9 | 4 | 8 | Pat Kelly | Lawrence-Dumont Stadium | dnq |
| 1988 | SDN | Riverside Red Wave | Calif | A+ | team page | 142 | 85 | 57 | -- | 753 | 620 | 133 | 1 | 3 | Tony Torchia | Riverside Sports Complex | League Champions |
| 1988 | SDN | Charleston (sc) Rainbows | SAL | A | team page | 138 | 85 | 53 | -- | 560 | 435 | 125 | 1 | 1 | Jack Krol | College Park | Lost in Finals |
| 1988 | SDN | Spokane Indians | Nwst | A- | team page | 76 | 42 | 34 | -- | 446 | 392 | 54 | 2 | 3 | Steve Lubratich | Avista Stadium | League Champions |
| 1988 | SDN | Arizona Padres | Ariz | Rk | team page | 59 | 31 | 28 | 3.5 | 383 | 377 | 6 | 2 | 2 | Jaime Moreno | Scottsdale Stadium | dnq |
| 1988 | SFN | San Francisco Giants | MLB-NL | MLB | team page | 162 | 83 | 79 | 11.5 | 670 | 626 | 44 | 4 | 6 | Roger Craig | Candlestick Park | dnq |
| 1988 | SFN | Phoenix Firebirds | PCL | AAA | team page | 143 | 67 | 76 | 19.5 | 728 | 758 | -30 | 4 | 7 | Wendell Kim | Phoenix Municipal Stadium | dnq |
| 1988 | SFN | Shreveport Captains | Tex | AA | team page | 136 | 74 | 62 | -- | 573 | 524 | 49 | 1 | 3 | Jack Mull | Fair Grounds Field | Lost in Semi-Finals |
| 1988 | SFN | San Jose Giants | Calif | A+ | team page | 143 | 91 | 52 | 3.0 | 853 | 563 | 290 | 2 | 2 | Duane Espy | San Jose Municipal Stadium | Lost in Semi-Finals |
| 1988 | SFN | Clinton Giants | Midw | A | team page | 140 | 78 | 62 | 9.0 | 587 | 498 | 89 | 3 | 6 | Billy Evers | Riverview Stadium | dnq |
| 1988 | SFN | Everett Giants | Nwst | A- | team page | 76 | 42 | 34 | -- | 449 | 396 | 53 | 1 | 4 | Joe Strain | Everett Memorial Stadium | dnq |
| 1988 | SFN | Pocatello Giants | Pio | Rk | team page | 70 | 26 | 44 | 18.0 | 358 | 521 | -163 | 4 | 7 | Jack Hiatt | Halliwell Park | dnq |
| 1988 | SEA | Seattle Mariners | MLB-AL | MLB | team page | 161 | 68 | 93 | 35.5 | 664 | 744 | -80 | 7 | 13 | Jim Snyder, Dick Williams | The Kingdome | dnq |
| 1988 | SEA | Calgary Cannons | PCL | AAA | team page | 142 | 68 | 74 | 17.0 | 775 | 823 | -48 | 3 | 5 | Marty Martinez, Bill Plummer | Foothills Stadium | dnq |
| 1988 | SEA | Vermont Mariners | East | AA | team page | 139 | 79 | 60 | 2.0 | 508 | 488 | 20 | 2 | 2 | Rich Morales | Centennial Field | Lost in Finals |
| 1988 | SEA | San Bernardino Spirit | Calif | A+ | team page | 142 | 74 | 68 | 11.0 | 686 | 688 | -2 | 3 | 5 | Ralph Dickenson | Perris Hill Park | dnq |
| 1988 | SEA | Wausau Timbers | Midw | A | team page | 140 | 52 | 88 | 32.0 | 603 | 817 | -214 | 7 | 14 | Rick Sweet | Athletic Park | dnq |
| 1988 | SEA | Bellingham Mariners | Nwst | A- | team page | 76 | 25 | 51 | 17.0 | 287 | 486 | -199 | 4 | 8 | P.J. Carey | Joe Martin Field | dnq |
| 1988 | SLN | St. Louis Cardinals | MLB-NL | MLB | team page | 162 | 76 | 86 | 25.0 | 578 | 633 | -55 | 5 | 10 | Whitey Herzog | Busch Stadium II | dnq |
| 1988 | SLN | Louisville Redbirds | Amer | AAA | team page | 142 | 63 | 79 | 26.0 | 532 | 647 | -115 | 4 | 8 | Mike Jorgensen | Cardinal Stadium | dnq |
| 1988 | SLN | Arkansas Travelers | Tex | AA | team page | 136 | 67 | 69 | 7.0 | 545 | 605 | -60 | 3 | 5 | Darold Knowles, Gaylen Pitts, Jim Riggleman | Ray Winder Field | dnq |
| 1988 | SLN | St. Petersburg Cardinals | FSL | A+ | team page | 136 | 68 | 68 | 3.5 | 521 | 556 | -35 | 3 | 10 | Dave Bialas | Al Lang Field | dnq |
| 1988 | SLN | Savannah Cardinals | SAL | A | team page | 135 | 68 | 67 | 15.5 | 486 | 524 | -38 | 5 | 6 | Keith Champion | Grayson Stadium | dnq |
| 1988 | SLN | Springfield Cardinals | Midw | A | team page | 139 | 81 | 58 | 5.5 | 646 | 548 | 98 | 2 | 3 | Mark DeJohn | Lanphier Park | Lost in Semi-Finals |
| 1988 | SLN | Hamilton Redbirds | NYPL | A- | team page | 75 | 36 | 39 | 10.5 | 300 | 311 | -11 | 3 | 7 | Joe Pettini | Bernie Arbour Memorial Stadium | dnq |
| 1988 | SLN | Johnson City Cardinals | App | Rk | team page | 72 | 41 | 31 | 5.5 | 372 | 324 | 48 | 3 | 3 | Jorge Aranzamendi, Gaylen Pitts | Howard Johnson Field | dnq |
| 1988 | TEX | Texas Rangers | MLB-AL | MLB | team page | 161 | 70 | 91 | 33.5 | 637 | 735 | -98 | 6 | 12 | Bobby Valentine | Arlington Stadium | dnq |
| 1988 | TEX | Oklahoma City 89ers | Amer | AAA | team page | 141 | 67 | 74 | 13.5 | 573 | 618 | -45 | 4 | 7 | Toby Harrah | All Sports Stadium | dnq |
| 1988 | TEX | Tulsa Drillers | Tex | AA | team page | 136 | 71 | 65 | 3.0 | 586 | 557 | 29 | 2 | 4 | Jim Skaalen | Tulsa County Stadium | League Champions |
| 1988 | TEX | Charlotte Rangers | FSL | A+ | team page | 137 | 72 | 65 | -- | 548 | 487 | 61 | 1 | 8 | Bob Jones | Charlotte County Stadium | dnq |
| 1988 | TEX | Gastonia Rangers | SAL | A | team page | 137 | 47 | 90 | 31.0 | 541 | 662 | -121 | 6 | 12 | Orlando Gomez | Sims Legion Park | dnq |
| 1988 | TEX | Butte Copper Kings | Pio | Rk | team page | 70 | 44 | 26 | -- | 551 | 437 | 114 | 1 | 2 | Bump Wills | Alumni Coliseum | Lost in Finals |
| 1988 | TEX | Gulf Coast Rangers | GCL | Rk | team page | 63 | 35 | 28 | 10.0 | 261 | 214 | 47 | 4 | 6 | Chino Cadahia | Charlotte County Stadium | dnq |
| 1988 | TOR | Toronto Blue Jays | MLB-AL | MLB | team page | 162 | 87 | 75 | 2.0 | 763 | 680 | 83 | 3 | 5 | Jimy Williams | Exhibition Stadium | dnq |
| 1988 | TOR | Syracuse Chiefs | IL | AAA | team page | 141 | 70 | 71 | 7.0 | 523 | 564 | -41 | 2 | 3 | Bob Bailor | MacArthur Stadium | dnq |
| 1988 | TOR | Knoxville Blue Jays | Sou | AA | team page | 144 | 75 | 69 | 6.5 | 594 | 531 | 63 | 3 | 4 | Barry Foote | Bill Meyer Stadium | dnq |
| 1988 | TOR | Dunedin Blue Jays | FSL | A+ | team page | 140 | 65 | 75 | 8.5 | 523 | 552 | -29 | 4 | 11 | Doug Ault | Grant Field | dnq |
| 1988 | TOR | Myrtle Beach Blue Jays | SAL | A | team page | 139 | 83 | 56 | 2.5 | 674 | 495 | 179 | 2 | 2 | Richie Hebner | Watson Stadium | Lost in Semi-Finals |
| 1988 | TOR | St. Catharines Blue Jays | NYPL | A- | team page | 73 | 27 | 46 | 18.5 | 261 | 359 | -98 | 6 | 10 | Eduardo Dennis | Community Park | dnq |
| 1988 | TOR | Medicine Hat Blue Jays | Pio | Rk | team page | 70 | 12 | 58 | 40.5 | 253 | 544 | -291 | 4 | 8 | Rocket Wheeler | Athletic Park | dnq |