| Alex Rubanowitz | 2B | 2012-2015 | UC Riverside |
| Matt Rubayo | OF | 2017-2019 | Marist |
| Kyle Rubbinaccio | P | 2012-2015 | Notre Dame |
| Ed Rubbo | 3B | 2005-2008 | Bucknell |
| Jason Rubenstein | P | 2012-2013 | Canisius College, Niagara County CC |
| Mike Rubertone | P | 2008-2008 | Fairfield |
| Chris Rubessa | C | 2011-2012 | Gardner-Webb |
| Felix Rubi | P | 2018-2020 | UCLA, Glendale CC CA |
| Claudio Rubiera | C | 2014-2017 | Southern Miss, Wabash Valley College, Barry |
| Kaeo Rubin | OF | 2004-2005 | Washington State, Edmonds CC |
| Shaun Rubin | P | 2013-2016 | Harvard |
| John Rubino | IF | 2012-2015 | Eastern Michigan |
| Nick Rubino | P | 2016-2019 | Sacred Heart |
| Noah Rubino | P | 2019-2019 | Siena College |
| Tucker Rubino | IF | 2011-2012 | Eastern Michigan, Glendale CC AZ |
| Miles Rubinski | OF | 2011-2011 | Stetson |
| Ty Rubio | OF | 2007-2010 | Illinois-Chicago |
| Chris Rubottom | 3B-OF | 2018-2019 | Wofford, Long Beach City College |
| Brian Ruby | 3B-1B | 2012-2015 | Binghamton |
| Mike Ruccio | P | 2010-2011 | Florida Atlantic |
| Dalton Ruch | IF | 2014-2017 | Hartford |
| Tyler Ruch | P-OF | 2007-2011 | Kansas State, Central Missouri |
| Aaron Ruchti | C | 2004-2005 | Sam Houston State, Angelina College |
| Andrew Ruck | OF | 2011-2013 | Lafayette College |
| Matt Ruckdeschel | OF | 2002-2004 | Jacksonville State |
| Garrett Ruckel | C | 2012-2015 | Jacksonville |
| Calvin Rucker | IF | 2018-2019 | Prairie View A&M |
| Davion Rucker | IF | 2010-2012 | Alabama A&M |
| Garrett Rucker | OF | 2014-2017 | Arkansas State |
| Jake Rucker | IF | 2019-2020 | Tennessee |
| Kyle Rucker | OF | 2008-2008 | Va Military Inst. |
| Trevor Rucker | IF | 2014-2017 | Southern Arkansas |
| Jordan Ruckman | P | 2013-2016 | Northern Illinois |
| Justin Ruckman | P-OF | 2013-2016 | Northern Illinois |
| Carson Rudd | P | 2018-2020 | Stanford |
| Nick Rudden | IF-OF | 2002-2004 | Michigan |
| Robert Rudder | 2B | 1999-2003 | UNC Asheville, Western Carolina |
| Bubba Ruddy | C | 2008-2008 | San Diego State, Cypress College |
| Tom Ruddy | OF | 2015-2018 | Yale |
| Danny Rude | P | 1992-1995 | Kansas |
| Jack Rude | P | 2016-2019 | Samford |
| Jacob Ruder | P | 2016-2018 | Kansas State, Cowley College, Oklahoma State |
| Jake Ruder | P | 2002-2003 | Central Ct State |
| Todd Ruder | P | 2004-2005 | Central Ct State |
| Joe Rudicil | C | 2002-2002 | Western Illinois |
| Matt Rudick | OF | 2018-2020 | San Diego State |
| Matt Rudis | P | 2019-2020 | Texas Christian |
| Brian Ruditys | OF | 2012-2015 | Quinnipiac |
| James Rudkin | 1B | 2015-2018 | Washington State, McLennan CC |
| Michael Rudman | P | 2007-2011 | Miami |
| Jake Rudnicki | P | 2014-2017 | Ohio |
| Josh Rudolfi | P | 2003-2005 | Butler |
| Brian Rudolph | OF | 2005-2008 | Fairfield |
| Jalen Rudolph | P | 2018-2019 | Norfolk State |
| Jimmy Rudolph | H | 2005-2005 | Bethune-Cookman |
| Brock Rudy | C | 2020-2020 | Utah |
| Kyle Rudy | IF | 2004-2007 | Houston, Texas-Arlington |
| Ryan Rue | P | 2019-2020 | Hofstra |
| Christian Ruebeck | --- | 2020-2020 | Oklahoma |
| Joey Rued | P | 2006-2008 | Brown |
| Willie Rueda | IF-OF | 2006-2009 | Texas Tech |
| Kyle Ruedisili | OF | 2015-2020 | Georgetown, Washington and Lee |
| Tyler Ruemmele | P | 2012-2015 | North Dakota |
| Kris Ruepke | P | 2008-2009 | Texas-San Antonio, Iowa Central CC |
| Austin Ruesch | P | 2018-2020 | Evansville, John A. Logan College, Abilene Christian |
| Bryan Ruff | C | 2007-2007 | Hawaii, Tacoma CC |
| Landan Ruff | OF | 2015-2018 | Missouri State |
| Matt Ruff | C | 2015-2018 | California |
| Rashad Ruff | --- | 2020-2020 | Coppin State College |
| Jason Ruffcorn | P | 2017-2020 | Texas A&M, Oklahoma |
| Parker Ruffer | P | 2016-2016 | Toledo |
| Jamie Ruffin | H | 2007-2007 | Miss. Valley St |
| Josh Ruffin | P | 2004-2007 | Texas-San Antonio |
| Josh Ruffin | P | 2011-2013 | Duke |
| Justin Ruffin | OF | 2001-2003 | James Madison |
| Mark Ruffin | P | 2005-2008 | Texas-San Antonio |
| Ned Ruffin | P | 2019-2020 | William and Mary |
| David Ruffing | P | 2004-2004 | Centenary College |
| Michael Ruffini | P | 2019-2019 | New York Tech |
| Tim Ruffino | --- | 2020-2020 | Coppin State College |
| Chris Ruffler | OF | 2009-2009 | New York Tech |
| Anthony Ruffolo | IF | 2007-2010 | Illinois State |
| Paul Rufo | IF | 2015-2018 | Binghamton |
| Garrett Rugg | IF | 2007-2010 | Rider |
| Robert Rugg | P | 2007-2009 | SE Louisiana, Garden City CC |
| Anthony Ruggerio | IF | 2010-2010 | Niagara |
| Edward Ruggers | P | 2013-2014 | Northwestern State, Galveston College |
| Andrew Ruggiero | --- | 2020-2020 | Maine |
| Mike Ruggiero | IF | 2018-2020 | Wagner |
| Ryan Ruggles | P | 2015-2018 | Alabama-Birmingham |
| John Ruhf | IF | 2002-2002 | Penn State |
| Dustin Ruhl | P | 2000-2003 | Ball State |
| Kevin Ruhl | P | 2002-2002 | Marshall |
| Nich Ruhl | P | 2018-2018 | Delaware State |
| Eric Ruhland | P-OF | 2001-2004 | La Salle |
| DJ Ruhlman | IF | 2012-2015 | Seton Hall |
| Brian Ruhm | IF | 2013-2017 | UC Davis, California Baptist |
| Alex Ruiz | P | 2019-2020 | Miami |
| Alfredo Ruiz | P | 2019-2020 | Long Beach State |
| Devin Ruiz | OF | 2015-2018 | UNC-Greensboro |
| Jason Ruiz | IF | 2004-2005 | Southern Utah, Southern Nevada |
| Jose Ruiz | IF | 2016-2020 | Cal State Northridge |
| Kevin Ruiz | P-OF | 2010-2012 | Georgia |
| Michael Ruiz | IF | 2012-2013 | Stephen F. Austin, Angelina College |
| Pablo Ruiz | --- | 2020-2020 | Central Florida |
| RJ Ruiz | IF | 2016-2018 | Texas A&M-Corpus Christi, Laredo CC |
| Santiago Ruiz | C | 2009-2012 | Texas A&M-Corpus Christi, Blinn College |
| Tony Ruiz | OF | 2003-2004 | McNeese State |
| Garret Rukes | P | 2017-2020 | Alabama |
| Christopher Rula | C | 2013-2016 | New York Tech |
| Jeff Rula | P | 2018-2018 | Fordham |
| Connor Rule | C | 2017-2018 | Kansas State |
| Jake Rule | P | 2005-2008 | William and Mary, Virginia |
| Ryan Ruley | OF | 2016-2019 | Loyola Marymount, Ohlone College, Chabot College |
| Nick Rulli | OF | 2012-2014 | Oregon State, San Joaquin Delta College |
| Erik Rumberger | P | 2010-2010 | Penn State |
| Pat Rumble | P | 2003-2003 | Florida |
| Aaron Rumfield | P | 2016-2017 | Northern Illinois, Midland College |
| T.J. Rumfield | IF | 2020-2020 | Texas Tech |
| Zach Rumfield | P | 2018-2020 | Texas A&M-Corpus Christi |
| Ryan Rummel | IF | 2007-2010 | Texas-San Antonio |
| Pat Rumoro | C | 2017-2019 | Louisville |
| Matt Rumpf | P | 2017-2018 | Florida Gulf Coast |
| Ryan Rumpf | P | 2012-2014 | Iowa |
| Billy Rumpke | OF | 2009-2012 | Columbia |
| Michael Rumpke | C | 2005-2008 | Furman, New Orleans, Navarro College |
| Bryan Rumple | P | 2004-2006 | Western Michigan |
| Dan Rumsey | OF | 2009-2009 | Kansas State |
| David Rumsey | P | 2012-2013 | Sam Houston State, Blinn College |
| Joseph Runco | IF | 2013-2016 | Fordham |
| Henry Rundio | 2B-SS | 2012-2015 | Gardner-Webb |
| Mike Rundle | 2B | 2004-2005 | Gonzaga |
| Shawn Runey | P | 2018-2020 | North Carolina Central, Patrick Henry CC |
| Collin Runge | IF | 2018-2019 | Portland, Western Oregon |
| Shota Runge | IF | 2013-2014 | Fresno State, Fresno City College |
| Taylor Runge | P | 2011-2012 | Bucknell |
| Andrew Runion | P | 2008-2008 | USC-Upstate |
| Wes Runnels | OF | 2011-2015 | Nicholls State, Mobile (Ala.), Coastal Ala |
| Colin Runt | IF | 2003-2006 | Penn State |
| Jake Runte | IF | 2009-2012 | Houston |
| Andy Runyan | C | 2002-2005 | Arkansas State |
| Gerald Runyan | OF | 2009-2012 | Bucknell |
| J.R. Runyon | IF | 2002-2002 | Oregon State |
| Graham Ruopp | P | 2016-2016 | Missouri |
| Hunter Ruoss | OF | 2006-2006 | Charleston Southern |
| David Ruot | IF-P | 2016-2019 | Abilene Christian |
| Cory Rupert | IF | 2007-2010 | Ohio State |
| Ryan Rupert | P | 2005-2007 | Louisiana Tech, Eastfield College |
| Jeremy Ruperto | C | 2008-2010 | Bethune-Cookman |
| Nate Rupiper | IF-C | 2012-2015 | Memphis |
| Jon Rupno | IF | 2003-2006 | Valparaiso |
| Anthony Rupp | P | 2016-2019 | Long Island-Brooklyn |
| Garrett Rupp | P | 2015-2018 | Harvard |
| Tim Rupp | C-IF | 2010-2011 | SE Missouri State, St. Louis CC-Forest Park |
| Nick Ruppert | OF | 2013-2016 | Dartmouth |
| Kevin Rupprecht | P | 2001-2002 | Arizona |
| AJ Rusbarsky | SS | 2008-2011 | Seton Hall, Charleston Southern |
| Brian Ruscello | IF-OF | 2002-2003 | Pittsburgh, Richmond |
| Conner Rusch | P | 2014-2014 | New Mexico |
| Rich Ruscio | OF | 2004-2005 | Canisius College |
| Tom Ruscitti | OF | 2019-2019 | Fairleigh Dickinson |
| Jamie Rusco | IF | 2003-2004 | UNC Charlotte, Barton County CC |
| Patrick Rusco | 1B | 1970-1973 | Stanford |
| Bobby Ruse | P | 2012-2015 | Maryland |
| Bailey Rush | IF | 2012-2015 | The Citadel |
| Jason Rush | H | 2002-2002 | Alcorn State |
| Joe Rush | P | 2010-2011 | Delaware State, Pratt CC |
| Kevin Rush | P | 2006-2009 | Wagner |
| Matt Rush | P | 2011-2012 | Oral Roberts, Cypress College |
| Nate Rush | 2B-SS | 2019-2019 | Fairleigh Dickinson |
| Ryne Rush | IF | 2012-2012 | High Point |
| Bo Rusher | C | 2020-2020 | Gardner-Webb |
| Ben Rushing | UT | 2020-2020 | Central Florida |
| Dalton Rushing | --- | 2020-2020 | Louisville |
| Rusty Rushing | P | 1999-2000 | Oklahoma State, Seminole Florida |
| Cheyenne Rushton | P | 2001-2002 | Utah, Salt Lake CC |
| John Rusin | OF | 2007-2008 | St. Bonaventure, Rhode Island |
| Jordan Rusk | P | 2010-2013 | USC-Upstate |
| Michael Rusk | P | 1970-1972 | San Jose State |
| Tanner Rusk | P | 2017-2020 | Alabama-Birmingham, Wallace State CC |
| Chris Rusler | P | 2007-2007 | Jacksonville, Hutchinson CC |
| Chris Rusnak | IF | 2001-2003 | SE Louisiana |
| Adam Rusnock | C | 2005-2008 | Western Kentucky |
| Adam Russ | OF | 2000-2002 | Hofstra |
| Austin Russ | IF-OF | 2016-2019 | USC, Azusa Pacific |
| Kodi Russ | IF | 2014-2018 | Florida A&M, Northwest Florida State College, Enterprise-Ozark |
| Ty Russ | OF-P | 2014-2018 | Florida A&M, Chipola College, Northwest Florida State College |
| Shundell Russaw | H | 2004-2006 | Jackson State, Jacksonville State |
| Aaron Russell | IF | 2007-2010 | Washington |
| Andy Russell | OF | 2008-2011 | Lehigh |
| Anthony Russell | IF | 2005-2008 | East Tennessee State |
| Brett Russell | IF | 2010-2011 | SE Missouri State, Kankakee CC |
| Brian Russell | P | 2009-2012 | Davidson College |
| Brian Russell | P | 2013-2013 | Rhode Island, College of Staten Island |
| Brody Russell | 2B | 2013-2016 | Fresno State |
| Carl Russell | IF | 2014-2017 | Northern Illinois |
| Carlos Russell | P | 2008-2008 | Coppin State College |
| Conor Russell | P | 2015-2017 | Lafayette College |
| Dan Russell | OF | 2003-2004 | Lehigh |
| Dan Russell | P | 2011-2012 | Western Illinois, Illinois Central College |
| Daniel Russell | OF | 2010-2013 | Eastern Michigan |
| Daniel Russell | C | 2019-2019 | Rice |
| Desmond Russell | UT | 2011-2014 | Jackson State |
| Donald Russell | 3B | 1968-1970 | Clemson |
| Evan Russell | IF-C | 2018-2020 | Tennessee |
| Jacob Russell | P | 2011-2013 | North Carolina Central |
| Jacob Russell | P | 2013-2014 | Kentucky, Campbellsville University |
| Jay Russell | IF | 2004-2007 | New Mexico |
| Josh Russell | C | 2016-2019 | Central Arkansas, Delta State |
| Julian Russell | IF | 2002-2003 | Hawaii, Feather River College |
| Julian Russell | IF | 2013-2017 | Chicago State |
| Justin Russell | P | 2011-2015 | The Citadel, Seminole Florida, Jacksonville |
| Justin Russell | 1B-2B | 2019-2020 | Kennesaw State |
| Kobie Russell | C | 2019-2019 | Hawaii-Hilo |
| Lance Russell | --- | 2020-2020 | New Mexico |
| Malc Russell | H | 2006-2006 | Arkansas-Pine Bluff |
| Mark Russell | C | 2008-2009 | Manhattan College, Saint Vincent College |
| Matt Russell | P | 2006-2006 | Maryland-Eastern Shore |
| Matt Russell | OF | 2010-2013 | Cal Poly |
| Matt Russell | P | 2018-2020 | Missouri State |
| Michael Russell | P | 2017-2019 | Stony Brook, Brookdale CC |
| Mike Russell | P | 2004-2004 | Quinnipiac |
| Mitch Russell | P | 2014-2014 | Loyola Marymount |
| Rich Russell | C-1B | 2003-2006 | Marshall |
| Rick Russell | C-OF | 2010-2011 | Memphis, Northwest Mississippi CC |
| Rob Russell | P | 2007-2010 | Lehigh |
| Sam Russell | OF | 2009-2012 | Central Michigan |
| Scott Russell | 3B | 2005-2005 | Wofford |
| Shane Russell | --- | 2020-2020 | Cornell |
| Taylor Russell | OF | 2009-2012 | Belmont, Northern Kentucky |
| Tim Russell | C | 2007-2008 | Central Florida, Polk State, Seminole Florida |
| Trey Russell | OF | 2013-2014 | Eastern Illinois, Joliet Junior College |
| Ty Russell | 1B | 2015-2016 | Alabama A&M, Marshalltown CC |
| Tyler Russell | P | 2014-2014 | Eastern Michigan |
| Zac Russell | C | 2010-2010 | Arkansas, Cisco Junior College, Incarnate Word |
| Zane Russell | --- | 2020-2020 | Dallas Baptist |
| Alex Russo | OF | 2019-2019 | Rutgers |
| Andrew Russo | C | 2008-2011 | Canisius College |
| Anthony Russo | OF | 2020-2020 | UC Riverside |
| Bill Russo | 3B-IF | 2018-2020 | Lafayette College |
| Bryan Russo | OF | 2008-2011 | UMD-Baltimore Cty |
| Chris Russo | IF | 2011-2011 | Va Military Inst. |
| Chris Russo | C | 2014-2016 | Iona College, Dowling College |
| Gary Russo | OF | 2014-2016 | Miami |
| Jake Russo | IF | 2015-2015 | Central Ct State |
| Joe Russo | IF | 2008-2011 | Fordham |
| Michael Russo | P | 2009-2010 | Texas State, Lon Morris College |
| Michael Russo | OF | 2016-2018 | Cal State Northridge |
| Mike Russo | 1B | 2001-2003 | Stony Brook, Suffolk County CC-Ammerman |
| Rocky Russo | IF | 2003-2005 | Hawaii |
| Sam Russo | C | 2016-2019 | Butler |
| Steve Russo | 2B-SS | 2005-2008 | UMD-Baltimore Cty |
| Thomas Russo | IF | 2015-2018 | Holy Cross |
| Tyler Russo | --- | 2020-2020 | Towson |
| Wayne Russo | IF | 2002-2006 | Rhode Island |
| Alex Russow | P | 2010-2010 | Quinnipiac |
| Cliff Russum | P | 2002-2006 | Southern Miss |
| Andrew Rust | P | 2019-2019 | Wake Forest |
| Cooper Rust | IF | 2020-2020 | Northern Colorado |
| Carter Rustad | P | 2020-2020 | San Diego |
| Derek Rustich | IF | 2014-2017 | UC Santa Barbara, Santa Barbara City College, Point Loma Nazarene |
| Chris Ruszin | IF | 2015-2018 | Towson |
| Adam Ruszkowski | P | 2004-2007 | University at Buffalo |
| Dan Rutan | P-IF | 2018-2019 | Oakland |
| Jordan Rutenbar | C | 2008-2009 | Texas-Pan American, Tyler Junior College |
| Dan Ruth | C | 2002-2005 | Toledo |
| Hunter Ruth | P | 2019-2019 | Florida |
| Kyle Ruth | IF | 2016-2019 | Long Island-Brooklyn, Southern New Hampshire |
| Matt Ruth | IF | 2002-2005 | Toledo |
| Brycen Rutherford | P | 2013-2014 | Cal State Northridge, Rio Hondo CC |
| Jacob Rutherford | --- | 2020-2020 | Gonzaga |
| Kyle Rutherford | P | 2015-2015 | New Mexico State |
| Patrick Rutherford | P | 2007-2007 | Holy Cross |
| Russ Rutherford | IF | 2002-2003 | Kentucky, Walters State CC |
| Sean Rutherford | IF-OF | 2013-2014 | William and Mary |
| Tyler Rutherford | P | 2003-2003 | Northern Iowa |
| Scott Ruthven | P | 2007-2008 | Wright State, Glen Oaks CC |
| Blake Rutkowski | OF | 2000-2002 | Michigan |
| Harry Rutkowski | P | 2018-2020 | Rutgers |
| Nick Rutkowski | --- | 2020-2020 | Oakland |
| Trevor Rutkowski | IF | 2009-2010 | Niagara, Elgin CC |
| Michael Rutland | IF | 2011-2012 | SE Louisiana, Holmes CC |
| Tre Rutland | P | 2010-2010 | Jackson State |
| Zach Rutland | C | 2008-2009 | Mississippi |
| Billy Ray Rutledge | OF | 2002-2002 | Northwestern State |
| Bryant Rutledge | P | 2009-2013 | Texas State, Angelo State |
| Matt Rutledge | IF | 2011-2011 | Nevada |
| Michael Rutledge | SS | 2004-2008 | Mississippi State, Samford |
| Chris Rutta | OF | 2007-2010 | Illinois-Chicago |
| Evan Rutter | P | 2012-2014 | Rice, Tulane |
| Edgar Ruvalcaba | C | 2016-2017 | UC Irvine |
| Mike Ruvolo | P | 2007-2010 | Air Force |
| Phil Ruzbarsky | OF | 2009-2012 | Richmond |
| Nate Ruzich | C | 2013-2015 | Northern Illinois, South Suburban College |
| Jeff Ruziecki | 1B | 2002-2003 | Wake Forest, Cypress College |
| Aaron Ruzinsky | OF | 2013-2013 | Davidson College |
| 296 record(s) |