| East | W | L | Pct | GB |
| Pittsburgh | 98 | 64 | .605 | -- |
| St. Louis | 84 | 78 | .519 | 14.0 |
| Philadelphia | 78 | 84 | .481 | 20.0 |
| Chi Cubs | 77 | 83 | .481 | 20.0 |
| NY Mets | 77 | 84 | .478 | 20.5 |
| Montreal | 71 | 90 | .441 | 26.5 |
| Pitcher | Game | Season | Result | Decision | IP | H | R | ER | HR | BB | SO | WP | BK | HB | TBF | Pitches | Str | Bal | Str% | Career G | Career W-L | Feat Description | |
| Dave Smith | 1991-04-10 | 1991 | W 2-0 vs SLN | Sv | 1 | 2 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 4 | 15 | 9 | 6 | 60% | 564 | 53-47 | 200th career save | |
| Heathcliff Slocumb | 1991-04-11 | 1991 | L 5-4 vs SLN | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 3 | 12 | 9 | 3 | 75% | 1 | 0-0 | 1st career game | ||
| Heathcliff Slocumb | 1991-04-14 | 1991 | W 6-4 vs PIT | W | 1.1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 4 | 18 | 10 | 8 | 56% | 3 | 1-0 | 1st career win | |
| Chuck McElroy | 1991-05-05 | 1991 | W 9-6 @ ATL | W | 2.1 | 1 | 0 | 0 | 0 | 1 | 2 | 0 | 0 | 0 | 8 | 35 | 23 | 12 | 66% | 37 | 1-1 | 1st career win | |
| Bob Scanlan | 1991-05-07 | 1991 | W 4-3 @ HOU | W | 7 | 5 | 1 | 0 | 0 | 2 | 1 | 0 | 0 | 0 | 29 | 85 | 54 | 31 | 64% | 1 | 1-0 | 1st career win, 1st career game | |
| Heathcliff Slocumb | 1991-05-24 | 1991 | W 4-3 vs MON | Sv | 0.1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 4 | 4 | 0 | 100% | 17 | 1-1 | 1st career save | |
| Chuck McElroy | 1991-05-25 | 1991 | W 6-1 vs MON | Sv | 4 | 4 | 1 | 1 | 1 | 1 | 3 | 0 | 0 | 0 | 16 | 62 | 41 | 21 | 66% | 42 | 1-1 | 1st career save | |
| Les Lancaster | 1991-06-09 | 1991 | L 6-3 vs LAN | 2 | 2 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 8 | 24 | 19 | 5 | 79% | 191 | 27-17 | Threw 79% strikes | ||
| Heathcliff Slocumb | 1991-06-10 | 1991 | L 13-5 vs LAN | 2 | 4 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 10 | 27 | 24 | 3 | 89% | 26 | 1-1 | Threw 89% strikes | ||
| Paul Assenmacher | 1991-06-11 | 1991 | L 8-6 vs SFN | 2 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 0 | 0 | 6 | 24 | 20 | 4 | 83% | 345 | 29-19 | Threw 83% strikes | ||
| Danny Jackson | 1991-06-14 | 1991 | W 7-3 @ SDN | W | 5 | 3 | 0 | 0 | 0 | 2 | 2 | 0 | 0 | 0 | 20 | 76 | 41 | 35 | 54% | 200 | 73-76 | 200th career game | |
| Paul Assenmacher | 1991-06-18 | 1991 | L 6-5 @ LAN | 2.1 | 0 | 0 | 0 | 0 | 0 | 6 | 0 | 0 | 0 | 7 | 27 | 20 | 7 | 74% | 350 | 29-19 | Struck out at least 2 batters per inning (1.2+ ip) | ||
| Greg Maddux | 1991-06-21 | 1991 | L 4-2 @ SFN | L | 7 | 4 | 2 | 2 | 1 | 1 | 10 | 2 | 0 | 1 | 27 | 117 | 78 | 39 | 67% | 155 | 66-58 | 10 Strikeouts | |
| Frank Castillo | 1991-06-27 | 1991 | L 4-3 @ PIT | 8 | 5 | 2 | 2 | 0 | 1 | 2 | 0 | 0 | 0 | 29 | 99 | 64 | 35 | 65% | 1 | 0-0 | 1st career game | ||
| Laddie Renfroe | 1991-07-03 | 1991 | L 11-7 vs PIT | 1.1 | 2 | 2 | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 6 | 27 | 17 | 10 | 63% | 1 | 0-0 | 1st career game | ||
| Frank Castillo | 1991-07-05 | 1991 | W 5-1 @ SLN | W | 9 | 6 | 1 | 1 | 0 | 2 | 4 | 0 | 0 | 0 | 34 | 116 | 70 | 46 | 60% | 3 | 1-0 | 1st career win | |
| Les Lancaster | 1991-07-13 | 1991 | W 4-3 vs HOU | W | CG | 9 | 10 | 3 | 3 | 0 | 0 | 5 | 0 | 0 | 0 | 35 | 117 | 79 | 38 | 68% | 200 | 30-19 | 200th career game |
| Bob Scanlan | 1991-07-16 | 1991 | L 8-5 @ ATL | L | 2 | 2 | 3 | 1 | 0 | 0 | 1 | 1 | 0 | 0 | 9 | 37 | 29 | 8 | 78% | 13 | 3-4 | Threw 78% strikes | |
| Shawn Boskie | 1991-08-24 | 1991 | L 4-1 vs SDN | 2 | 3 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 9 | 28 | 21 | 7 | 75% | 36 | 9-14 | Threw 75% strikes | ||
| Paul Assenmacher | 1991-08-24 | 1991 | L 4-1 vs SDN | 2.1 | 0 | 0 | 0 | 0 | 0 | 5 | 0 | 0 | 0 | 7 | 34 | 23 | 11 | 68% | 372 | 33-21 | Struck out at least 2 batters per inning (1.2+ ip) | ||
| Frank Castillo | 1991-08-27 | 1991 | W 2-1 vs LAN | W | CG | 9 | 3 | 1 | 1 | 0 | 2 | 7 | 1 | 0 | 0 | 31 | 121 | 77 | 44 | 64% | 11 | 5-2 | 3-hitter |
| Frank Castillo | 1991-09-06 | 1991 | W 3-2 vs SFN | W | 8.1 | 3 | 2 | 1 | 0 | 1 | 10 | 0 | 0 | 0 | 29 | 117 | 83 | 34 | 71% | 13 | 6-3 | 10 Strikeouts | |
| Bob Scanlan | 1991-09-10 | 1991 | W 6-2 vs PIT | Sv | 1.1 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 21 | 15 | 6 | 71% | 28 | 5-7 | 1st career save | |
| Greg Maddux | 1991-09-18 | 1991 | W 4-1 @ NYN | W | 9 | 5 | 1 | 1 | 0 | 0 | 2 | 0 | 0 | 0 | 32 | 103 | 78 | 25 | 76% | 173 | 72-63 | Threw 76% strikes | |
| Paul Assenmacher | 1991-09-28 | 1991 | L 3-2 @ SLN | 2 | 1 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 7 | 23 | 19 | 4 | 83% | 385 | 33-23 | Threw 83% strikes | ||
| Yorkis Perez | 1991-09-30 | 1991 | L 6-5 @ PHI | 0.1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 7 | 4 | 3 | 57% | 1 | 0-0 | 1st career game | ||
| Greg Maddux | 1991-10-02 | 1991 | W 1-0 @ PHI | W | SHO | 9 | 3 | 0 | 0 | 0 | 0 | 6 | 0 | 0 | 0 | 30 | 90 | 64 | 26 | 71% | 176 | 74-64 | Complete game/Shutout, 3-hitter |
| Yorkis Perez | 1991-10-05 | 1991 | W 7-5 vs SLN | W | 2 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 8 | 25 | 13 | 12 | 52% | 3 | 1-0 | 1st career win | |