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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WAR | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Mac Aaron | .00 | 1990-2007 | |
| 1 | Carl Abadee | .00 | 2023-2036 | |
| 1 | Todd Abarca# | .00 | 2056-2058 | |
| 1 | Kagan Abbasi# | .00 | 2057-2060 | |
| 1 | Davis Abbott | .00 | 2039-2045 | |
| 1 | Robert Abbott | .00 | 1987-2000 | |
| 1 | Tyrone Abbott | .00 | 1990-2000 | |
| 1 | Akira Abe | .00 | 1978-1993 | |
| 1 | Art Abrams | .00 | 1988-1990 | |
| 1 | Tom Abrams | .00 | 2016-2024 | |
| 1 | Tom Ackers | .00 | 2018-2030 | |
| 1 | Benny Ackley# | .00 | 2049-2059 | |
| 1 | Joe Acuña | .00 | 1986-1994 | |
| 1 | Ippei Adachi | .00 | 1998-2010 | |
| 1 | Ricky Adame | .00 | 2001-2007 | |
| 1 | Jamie Adams | .00 | 2019-2024 | |
| 1 | Kolton Adams# | .00 | 2054-2058 | |
| 1 | Ron Adams | .00 | 1996-2004 | |
| 1 | Samson Adams | .00 | 2023-2027 | |
| 1 | Wayne Adams | .00 | 2006-2014 | |
| 1 | Dave Adamson | .00 | 2008-2013 | |
| 1 | Tommie Adamson# | .00 | 2054-2060 | |
| 1 | Robby Adelsberger | .00 | 2025-2036 | |
| 1 | Kurtis Adigamoff | .00 | 2042-2042 | |
| 1 | Yidir Adili | .00 | 1992-2007 | |
| 1 | William Adkins# | .00 | 2051-2060 | |
| 1 | Yoshinaka Agano | .00 | 1997-2007 | |
| 1 | Nestor Aguilar | .00 | 1992-2008 | |
| 1 | Joe Aguilara | .00 | 1978-1990 | |
| 1 | Arvin Aguilera | .00 | 2046-2049 | |
| 1 | Cristián Aguirre | .00 | 1992-2000 | |
| 1 | Michael Aiken | .00 | 2050-2059 | |
| 1 | Dustin Aitkenhead | .00 | 1981-1988 | |
| 1 | Augustin Ajello | .00 | 1996-2000 | |
| 1 | Dusty Akkerman | .00 | 2029-2043 | |
| 1 | Garry Akoniia# | .00 | 2053-2057 | |
| 1 | Kifle Al-Sadat | .00 | 1986-2002 | |
| 1 | Eddy Alanis | .00 | 2000-2015 | |
| 1 | Aubrey Albano# | .00 | 2041-2060 | |
| 1 | Amato Albors | .00 | 1978-1990 | |
| 1 | Octavio Alcantar | .00 | 2026-2028 | |
| 1 | Zeus Alder | .00 | 2036-2052 | |
| 1 | Edwin Alderdice | .00 | 2017-2023 | |
| 1 | Ricky Alejo | .00 | 2023-2030 | |
| 1 | Gunnar Alencastre | .00 | 2039-2043 | |
| 1 | Don Alexander | .00 | 1980-1994 | |
| 1 | Jayden Alexander | .00 | 2027-2033 | |
| 1 | Jeremiah Alexander | .00 | 1987-2001 | |
| 1 | Danny Alfaro | .00 | 2033-2044 | |
| 1 | Víctor Alicea | .00 | 1986-1999 | |
| 1 | Victor Allard | .00 | 1990-1995 | |
| 1 | Dave Allen | .00 | 2008-2020 | |
| 1 | Jeremy Allen | .00 | 2037-2043 | |
| 1 | Josh Allen | .00 | 2026-2042 | |
| 1 | Tom Allen | .00 | 2015-2021 | |
| 1 | Benji Allgood | .00 | 2038-2044 | |
| 1 | Tom Allgood | .00 | 2029-2042 | |
| 1 | Jamie Allie | .00 | 2027-2034 | |
| 1 | Taylor Allison# | .00 | 2051-2060 | |
| 1 | Byron Allomes | .00 | 2031-2036 | |
| 1 | Gustavo Almaraz | .00 | 2010-2021 | |
| 1 | Edgar Alonzo | .00 | 2036-2043 | |
| 1 | Caleb Alston | .00 | 1987-1993 | |
| 1 | Tariq Alston# | .00 | 2055-2060 | |
| 1 | Billy Alvarado | .00 | 2002-2017 | |
| 1 | Daniel Alvarez | .00 | 1999-2013 | |
| 1 | Ignacio Alvarez | .00 | 2004-2019 | |
| 1 | Leopold Alvarez | .00 | 2045-2050 | |
| 1 | Victor Alvarez | .00 | 1996-2012 | |
| 1 | Joe Alveraz | .00 | 1978-1993 | |
| 1 | Zack Amaral | .00 | 2005-2012 | |
| 1 | Danny Amaya | .00 | 2007-2015 | |
| 1 | Peyton Ames# | .00 | 2055-2060 | |
| 1 | Guillermo Amill | .00 | 2007-2017 | |
| 1 | Francis Amoruso | .00 | 1990-1994 | |
| 1 | Ron Amundson | .00 | 2000-2012 | |
| 1 | Daniel Amyot | .00 | 2014-2025 | |
| 1 | Maho Anastaclo | .00 | 1984-1992 | |
| 1 | Héctor Anaya | .00 | 1991-2003 | |
| 1 | Colin Anderson | .00 | 2004-2011 | |
| 1 | Damian Anderson | .00 | 2004-2010 | |
| 1 | Gregory Anderson | .00 | 2048-2058 | |
| 1 | Jimmy Anderson | .00 | 2018-2027 | |
| 1 | Joey Anderson | .00 | 2009-2009 | |
| 1 | Julian Anderson | .00 | 2039-2045 | |
| 1 | Lucas Anderson# | .00 | 2052-2060 | |
| 1 | Micah Anderson | .00 | 2029-2043 | |
| 1 | Rick Anderson# | .00 | 2049-2060 | |
| 1 | Ronald Anderson# | .00 | 2054-2060 | |
| 1 | Thomas Anderson# | .00 | 2052-2060 | |
| 1 | Amoldo Andradez | .00 | 1983-1994 | |
| 1 | Ed Andrew | .00 | 1985-1995 | |
| 1 | Dustin Andrews | .00 | 2046-2049 | |
| 1 | Al Anguiano | .00 | 2009-2023 | |
| 1 | Tyrone Annear | .00 | 2032-2035 | |
| 1 | Drew Ansell | .00 | 2037-2043 | |
| 1 | Xalbador Ansoátegui | .00 | 1986-1988 | |
| 1 | Garett Antcliff | .00 | 2025-2028 | |
| 1 | Brad Antell | .00 | 1993-2000 | |
| 1 | Samuel Antell | .00 | 1988-1990 |
