MLB Players
| Player | Position | Team |
|---|---|---|
| Andy Abad | 1B | Milwaukee |
| Fernando Abad | RP | NY Yankees |
| Luis Abad | SP | Houston |
| Dom Abbadessa | CF | Toronto |
| Alex Abbott | RF | LA Angels |
| Andrew Abbott | RP | NY Yankees |
| Cory Abbott | SP | Chicago |
| Sam Abbott | 1B | Chicago Sox |
| Imani Abdullah | P | LA Dodgers |
| Kenta Abe | RP | (Minor Leagues) |
| Masahiro Abe | 2B | (Minor Leagues) |
| Shinnosuke Abe | C | (Minor Leagues) |
| Mitch Abeita | C | NY Yankees |
| Kevin Abel | SP | San Diego |
| Mick Abel | P | Philadelphia |
| Reggie Abercrombie | CF | Houston |
| Brent Abernathy | 2B | Washington |
| Adam Abraham | 3B | Cleveland |
| CJ Abrams | SS | San Diego |
| Abner Abreu | RF | Cleveland |
| Albert Abreu | SP | NY Yankees |
| Bryan Abreu | RP | Houston |
| Erick Abreu | SP | Houston |
| Esdras Abreu | LF | Texas |
| Gio Abreu | RP | Texas |
| Jose Abreu | 1B | Chicago Sox |
| Juan Abreu | RP | LA Dodgers |
| Juan Carlos Abreu | CF | Boston |
| Michael Abreu | SS | (Minor Leagues) |
| Michel Abreu | 1B | (Minor Leagues) |
| Mike Abreu | 2B | Arizona |
| Nelfy Abreu | SS | Boston |
| Osvaldo Abreu | SS | Washington |
| Pablo Abreu | CF | Milwaukee |
| Tony Abreu | 2B | (Minor Leagues) |
| William Abreu | LF | (Minor Leagues) |
| Willie Abreu | RF | Colorado |
| Winston Abreu | RP | Kansas City |
| Jeremy Accardo | RP | Arizona |
| Andury Acevedo | RP | Chicago |
| Domingo Acevedo | RP | NY Yankees |
| Jhohan Acevedo | CF | St. Louis |
| Jose Acevedo | P | (Free Agent) |
| Randy Acevedo | SP | Kansas City |
| Stiven Acevedo | RF | Baltimore |
| Yoneiry Acevedo | 2B | Detroit |
| Alfredo Aceves | RP | (Deleted) |
| A.J. Achter | RP | (Free Agent) |
| Dane Acker | P | Oakland |
| Hunter Ackerman | SP | Chicago |
| Dustin Ackley | LF | (Free Agent) |
| Aldry Acosta | SP | LA Dodgers |
| Christopher Acosta | SP | Boston |
| Daison Acosta | SP | NY Mets |
| Jose Acosta | 2B | Cincinnati |
| Kelyn Acosta | P | San Francisco |
| Leisman Acosta | 2B | Miami |
| Luis Acosta | SS | Chicago |
| Matthew Acosta | CF | San Diego |
| Maximo Acosta | SS | Texas |
| Mayobanex Acosta | C | Tampa Bay |
| Victor Acosta | 3B | Boston |
| Yhoan Acosta | RP | Houston |
| Ronald Acuna Jr. | LF | Atlanta |
| Francisco Acuna | SS | Pittsburgh |
| Jose Acuna | SP | NY Mets |
| Luisangel Acuna | SS | Texas |
| Travis Adair | 2B | Texas |
| Jason Adam | RP | Chicago |
| Cristhian Adames | SS | San Francisco |
| Jose Adames | SP | Miami |
| Willy Adames | SS | Tampa Bay |
| Yunelky Adames | 1B | Pittsburgh |
| Austin Adams | RP | Minnesota |
| Austin Adams | RP | San Diego |
| Brian Adams | OF | San Diego |
| Caleb Adams | RF | LA Angels |
| Chance Adams | RP | Kansas City |
| Cody Adams | SP | Milwaukee |
| David Adams | 3B | Toronto |
| Jake Adams | 1B | Houston |
| Jason Adams | RP | Kansas City |
| Jesse Adams | RP | Cincinnati |
| Johnny Adams | SS | Seattle |
| Jordyn Adams | CF | LA Angels |
| Joshua Adams | SS | Miami |
| Lane Adams | LF | Minnesota |
| Matt Adams | 1B | (Free Agent) |
| Mike Adams | RP | LA Dodgers |
| Mike Adams | P | Boston |
| Riley Adams | C | Toronto |
| Ryan Adams | 2B | LA Dodgers |
| Spencer Adams | SP | Chicago Sox |
| Trever Adams | OF | Texas |
| Zak Adams | P | Toronto |
| Corey Adamson | RF | San Diego |
| Daniel Adamson | OF | Houston |
| Brett Adcock | P | Houston |
| Nate Adcock | RP | Baltimore |
| Ty Adcock | P | Seattle |
| Nick Additon | SP | St. Louis |
| Jim Adduci | LF | (Free Agent) |
| Jo Adell | LF | LA Angels |
| Aramis Ademan | SS | Chicago |
| Hunter Adkins | P | Milwaukee |
| James Adkins | RP | LA Dodgers |
| Jon Adkins | RP | Chicago Sox |
| Tim Adleman | SP | Detroit |
| Micker Adolfo | RF | Chicago Sox |
| Ross Adolph | CF | Houston |
| Joan Adon | SP | Washington |
| Melvin Adon | SP | San Francisco |
| Ranfy Adon | CF | NY Mets |
| Ehire Adrianza | SS | Minnesota |
| Josh Advocate | P | Texas |
| Joe Aeilts | RF | Colorado |
| Austin Afenir | 1B | NY Yankees |
| Sam Agnew-Wieland | P | NY Yankees |
| Jake Agnos | P | NY Yankees |
| Martin Agosta | P | San Francisco |
| Edrick Agosto | P | Tampa Bay |
| Kenedy Agramonte | SP | NY Yankees |
| Dario Agrazal | SP | Detroit |
| Geison Aguasviva | RP | LA Dodgers |
| Juaner Aguasvivas | 1B | Detroit |
| Ramon Aguero | RP | Pittsburgh |
| Carlos Aguiar | LF | Minnesota |
| Maikel Aguiar | SP | Chicago |
| Chris Aguila | LF | Miami |
| Osmel Aguila | CF | Philadelphia |
| Roidany Aguila | C | Arizona |
| Angel Aguilar | SS | NY Yankees |
| Cesar Aguilar | P | St. Louis |
| Jesus Aguilar | 1B | Miami |
| Omar Aguilar | RP | Milwaukee |
| Eric Aguilera | 1B | LA Angels |
| Rodolfo Aguirre | P | Pittsburgh |
| Telmito Agustin | LF | Washington |
| Devan Ahart | CF | LA Dodgers |
| Alan Ahmady | 1B | St. Louis |
| Mike Ahmed | LF | Arizona |
| Nick Ahmed | SS | Arizona |
| Kevin Ahrens | 3B | Toronto |
| John Aiello | 3B | Toronto |
| Brady Aiken | SP | Cleveland |
| Craig Aikin | CF | St. Louis |
| Iolana Akau | C | Oakland |
| Cole Aker | P | St. Louis |
| Keegan Akin | SP | Baltimore |
| Jared Akins | LF | Minnesota |
| Jordan Akins | RF | Texas |
| Nick Akins | LF | LA Dodgers |
| Shogo Akiyama | LF | Cincinnati |
| Tyler Alamo | C | Chicago |
| Adrian Alaniz | SP | Philadelphia |
| R.J. Alaniz | RP | Cincinnati |
| Jesus Alastre | RF | Philadelphia |
| Tomas Alastre | RP | Washington |
| Jonathan Albaladejo | RP | NY Mets |
| Matt Albanese | CF | Minnesota |
| Marco Albano | 2B | LA Angels |
| Andrew Albers | SP | (Free Agent) |
| Matt Albers | RP | (Free Agent) |
| Reese Albert | LF | (Minor Leagues) |
| Hanser Alberto | 2B | Baltimore |
| Jose Albertos | SP | Chicago |
| Will Albertson | C | San Francisco |
| Ozzie Albies | 2B | Atlanta |
| Zach Albin | P | Baltimore |
| Al Alburquerque | RP | (Free Agent) |
| Jorge Alcala | RP | Minnesota |
| Adrian Alcantara | SP | Kansas City |
| Arismendy Alcántara | 2B | LA Angels |
| Deivid Alcantara | RF | Cincinnati |
| Elisandro Alcantara | CF | Colorado |
| Kevin Alcantara | CF | NY Yankees |
| Nichel Alcantara | SP | Baltimore |
| Randel Alcantara | 3B | Detroit |
| Sandy Alcantara | SP | Miami |
| Sergio Alcantara | SS | Detroit |
| Victor Alcantara | RP | (Suspended) |
| Larry Alcime | CF | Pittsburgh |
| Argenis Aldazoro | 1B | Cincinnati |
| Pablo Aldonis | SP | Washington |
| Carter Aldrete | 1B | San Francisco |
| Cory Aldridge | RF | Toronto |
| Luis Alecis | SP | Cincinnati |
| Delvis Alegre | SP | Miami |
| Stephen Alemais | 2B | Pittsburgh |
| Blaze Alexander | SS | Arizona |
| CJ Alexander | 3B | Atlanta |
| Dayton Alexander | OF | Oakland |
| Evan Alexander | CF | NY Yankees |
| John Alexander | 1B | Tampa Bay |
| Joshua Alexander | OF | Cincinnati |
| Manny Alexander | 2B | Washington |
| Nathan Alexander | P | Miami |
| Scott Alexander | RP | LA Dodgers |
| Theo Alexander | OF | LA Dodgers |
| Tyler Alexander | SP | Detroit |
| A.J. Alexy | SP | Texas |
| Lewis Alezones | SP | Philadelphia |
| Adrian Alfaro | SS | Detroit |
| Jason Alfaro | 3B | NY Mets |
| Jhoandro Alfaro | C | Chicago Sox |
| John Alfaro | SS | Kansas City |
| Jorge Alfaro | C | Miami |
| Pedro Alfonseca | RF | Cleveland |
| Eliezer Alfonzo | C | LA Dodgers |
| Eliezer Alfonzo | C | Detroit |
| Giovanny Alfonzo | 2B | Miami |
| Omar Alfonzo | C | Pittsburgh |
| Anthony Alford | LF | Pittsburgh |
| Brandon Alger | RP | San Diego |
| Angel Alicea | P | Toronto |
| Anthony Aliotti | 1B | Oakland |
| Matthew Allan | SP | NY Mets |
| Kolby Allard | SP | Texas |
| Alex Allbritton | 3B | LA Angels |
| Forrestt Allday | CF | Boston |
| Cam Alldred | P | Pittsburgh |
| Justin Alleman | P | San Francisco |
| Blake Allemand | 2B | Milwaukee |
| Austin Allen | C | Oakland |
| Brandon Allen | 1B | (Free Agent) |
| Brandon Allen | P | San Francisco |
| Brenton Allen | LF | Washington |
| Chris Allen | P | Chicago |
| Cody Allen | RP | (Free Agent) |
| Greg Allen | LF | San Diego |
| James Allen | P | Cincinnati |
| Jerrell Allen | OF | Kansas City |
| Jimmy Allen | 2B | LA Dodgers |
| Kevin Allen | P | Kansas City |
| Kyle Allen | SP | NY Mets |
| Logan Allen | RP | Cleveland |
| Logan Allen | LF | Tampa Bay |
| Logan Allen | P | Cleveland |
| Luke Allen | RF | LA Dodgers |
| Nick Allen | SS | Oakland |
| Scottie Allen | SP | NY Yankees |
| Trever Allen | LF | LA Angels |
| William Allen | C | Detroit |
| Willie Allen | OF | Washington |
| Nick Allgeyer | P | Toronto |
| Stetson Allie | 1B | Pittsburgh |
| Chet Allison | OF | LA Dodgers |
| Jeff Allison | P | (Minor Leagues) |
| Kenneth Allison | CF | Milwaukee |
| Tanner Allison | P | Atlanta |
| Breland Almadova | CF | Arizona |
| Carlos Almanzar | P | Boston |
| Elian Almanzar | P | Chicago |
| Luis Almanzar | SS | San Diego |
| Michael Almanzar | 3B | Baltimore |
| Jose Almarante | RP | St. Louis |
| Jacoby Almaraz | 3B | St. Louis |
| Adrian Almeida | RP | NY Mets |
| Diogenes Almengo | SP | Houston |
| Zachery Almond | C | Arizona |
| Abraham Almonte | CF | (Free Agent) |
| Ariel Almonte | LF | (Minor Leagues) |
| Denny Almonte | RF | Seattle |
| Erick Almonte | RF | Milwaukee |
| Hector Almonte | P | Chicago |
| Jose Almonte | SP | Arizona |
| Jose Almonte | RF | Texas |
| Joshua Almonte | OF | Toronto |
| Jostyn Almonte | RF | NY Mets |
| Marcos Almonte | 3B | Houston |
| Max Almonte | P | St. Louis |
| Miguel Almonte | RP | (Free Agent) |
| Yency Almonte | RP | Colorado |
| Yohan Almonte | SP | NY Mets |
| Zoilo Almonte | LF | (Free Agent) |
| Albert Almora Jr. | CF | Chicago |
| Carlos Alonso | 2B | Philadelphia |
| John Alonso | 1B | Milwaukee |
| Lazaro Alonso | 1B | Miami |
| Pete Alonso | 1B | NY Mets |
| Yonder Alonso | 1B | San Diego |
| Yimmelvyn Alonzo | SS | Texas |
| Benjamin Alsup | P | Colorado |
| Xavier Altamirano | SP | Oakland |
| Dan Altavilla | RP | San Diego |
| Josh Altmann | SS | Texas |
| Bo Altobelli | C | Minnesota |
| Dom Altobelli | 3B | Colorado |
| J.J. Altobelli | 3B | St. Louis |
| Brayan Altuve | C | Chicago |
| Jose Altuve | 2B | Houston |
| Jake Alu | 2B | Washington |
| Cristian Alvarado | SP | Baltimore |
| Darwin Alvarado | RF | Detroit |
| Elvis Alvarado | RF | Seattle |
| Henry Alvarado | 1B | St. Louis |
| Jose Alvarado | RP | Tampa Bay |
| Luis Alvarado | P | LA Angels |
| Abe Alvarez | P | (Deleted) |
| Andres Alvarez | 2B | Pittsburgh |
| Antonio Alvarez | 2B | Arizona |
| Daniel Alvarez | RP | NY Yankees |
| Dariel Álvarez | RF | (Free Agent) |
| Dario Alvarez | RP | Minnesota |
| Eddy Alvarez | 2B | Miami |
| Eliezer Álvarez | 2B | Texas |
| Francisco Alvarez | C | NY Mets |
| Henderson Álvarez | SP | Pittsburgh |
| Jhosmer Alvarez | SP | Arizona |
| Jose Alvarez | RP | Philadelphia |
| Mandy Alvarez | 3B | NY Yankees |
| Manuel Alvarez | P | NY Mets |
| Matt Alvarez | RP | Kansas City |
| Miguel Alvarez | LF | Philadelphia |
| Nelson Alvarez | P | NY Yankees |
| Pedro Álvarez | 1B | (Free Agent) |
| R.J. Álvarez | RP | (Free Agent) |
| Richard Alvarez | P | Texas |
| Ricky Alvarez | 3B | LA Angels |
| Roberto Alvarez | C | Tampa Bay |
| Yordan Alvarez | LF | Houston |
| Yorkislandy Alvarez | 3B | Baltimore |
| Jared Alvarez-Lopez | C | San Diego |
| Sam Alvis | P | Miami |
| Zach Alvord | 2B | Atlanta |
| Adbert Alzolay | SP | Chicago |
| Adael Amador | SS | Colorado |
| Japhet Amador | 1B | Houston |
| Wilson Amador | SS | Houston |
| Beau Amaral | OF | Cincinnati |
| Daniel Amaral | CF | Pittsburgh |
| Mario Amaral | C | Milwaukee |
| Alexi Amarista | SS | (Free Agent) |
| Anderson Amarista | SP | Colorado |
| Gioskar Amaya | SS | Chicago |
| Jacob Amaya | SS | LA Dodgers |
| Luis Amaya | RP | San Francisco |
| Miguel Amaya | C | Chicago |
| Chip Ambres | RF | Boston |
| Hector Ambriz | RP | Washington |
| Trey Amburgey | LF | NY Yankees |
| Mike Amditis | C | Cleveland |
| Angelo Amendolare | 2B | LA Angels |
| Edmond Americaan | CF | Chicago |
| Jeffrey Ames | P | Tampa Bay |
| Nick Ames | 1B | Detroit |
| Alfredo Amezaga | 2B | (Free Agent) |
| Jose Amezcua | P | Cincinnati |
| Richard Amion | CF | San Francisco |
| Justin Amlung | P | Chicago |
| Yeuri Amparo | RF | Washington |
| Jonathan Amundaray | LF | NY Yankees |
| Jake Anchia | C | Seattle |
| Luke Anders | 1B | San Francisco |
| Austen Anderson | SS | Baltimore |
| Ben Anderson | P | Texas |
| Blake Anderson | C | Miami |
| Brett Anderson | SP | Milwaukee |
| Brett Anderson | SS | Detroit |
| Brian Anderson | RP | Chicago Sox |
| Brian Anderson | P | Tampa Bay |
| Brian Anderson | 3B | Miami |
| Brian Anderson | RP | San Francisco |
| Bryan Anderson | C | Oakland |
| Calvin Anderson | 1B | Pittsburgh |
| Carl Anderson | CF | Pittsburgh |
| Chase Anderson | SP | Toronto |
| Chris Anderson | SP | LA Dodgers |
| Cole Anderson | LF | Colorado |
| Dixon Anderson | P | Washington |
| Drew Anderson | LF | Cincinnati |
| Drew Anderson | RP | (Free Agent) |
| Elliott Anderson | P | Kansas City |
| Grant Anderson | P | Seattle |
| Ian Anderson | SP | Atlanta |
| Isaac Anderson | P | LA Dodgers |
| Jack Anderson | P | Seattle |
| Jacob Anderson | OF | Toronto |
| Jake Anderson | 2B | NY Yankees |
| Jason Anderson | P | Philadelphia |
| John Anderson | P | Toronto |
| Josh Anderson | LF | Atlanta |
| Josh Anderson | 3B | Arizona |
| Justin Anderson | RP | LA Angels |
| Leslie Anderson | CF | Tampa Bay |
| Matt Anderson | P | (Free Agent) |
| Matt Anderson | SP | Pittsburgh |
| Nick Anderson | RP | Tampa Bay |
| Reid Anderson | P | Texas |
| Ryan Anderson | P | NY Yankees |
| Shaun Anderson | SP | San Francisco |
| Tanner Anderson | RP | Oakland |
| Tim Anderson | SS | Chicago Sox |
| Tyler Anderson | SP | San Francisco |
| Will Anderson | SP | St. Louis |
| Robert Andino | 2B | Baltimore |
| Greifer Andrade | SS | Seattle |
| Steve Andrade | P | Tampa Bay |
| Pete Andrelczyk | P | Miami |
| John Andreoli | RF | (Free Agent) |
| Clayton Andrews | RP | Milwaukee |
| Tanner Andrews | P | Miami |
| Matt Andriese | RP | LA Angels |
| Chris Andritsos | SP | (Minor Leagues) |
| Nick Andros | RP | Kansas City |
| Elvis Andrus | SS | Texas |
| Axel Andueza | 1B | Arizona |
| Miguel Andujar | 3B | NY Yankees |
| Yoel Andujar | RF | Washington |
| Nick Anello | P | (Minor Leagues) |
| Isaac Anesty | P | Cincinnati |
| Ryan Anetsberger | 1B | Miami |
| Euribiel Angeles | 2B | San Diego |
| Matt Angle | CF | Oakland |
| Luis Anguizola | C | San Diego |
| Argenis Angulo | P | Cleveland |
| Joalbert Angulo | SP | Philadelphia |
| Tomohiro Anraku | SP | (Minor Leagues) |
| Chase Anselment | OF | Atlanta |
| Kyle Anson | C | NY Yankees |
| Jose Antequera | 2B | Philadelphia |
| Josh Anthony | 3B | Atlanta |
| Jeff Antigua | SP | Chicago |
| Dustin Antolin | RP | Chicago Sox |
| Mike Anton | P | LA Angels |
| Rick Anton | P | LA Dodgers |
| Tejay Antone | SP | Cincinnati |
| Matt Antonelli | 2B | Cleveland |
| Aaron Antonini | C | St. Louis |
| Michael Antonini | RP | LA Dodgers |
| Mike Antonio | SS | Kansas City |
| Yasel Antuna | SS | Washington |
| Robert Antunez | 2B | San Francisco |
| Oraj Anu | LF | Boston |
| Evan Anundsen | SP | Milwaukee |
| Juan Aparicio | 3B | Philadelphia |
| Miguel Aparicio | CF | Texas |
| Ryan Aper | CF | Miami |
| Andrew Aplin | OF | Houston |
| Rhett Aplin | 1B | Kansas City |
| Leonel Aponte | SP | Philadelphia |
| Shendrik Apostel | 1B | Pittsburgh |
| Sherten Apostel | 3B | Texas |
| Paul Applebee | P | Washington |
| Aristides Aquino | RF | Cincinnati |
| Charlis Aquino | SS | San Diego |
| Greg Aquino | RP | Chicago Sox |
| Ismael Aquino | SP | Oakland |
| Jayson Aquino | RP | (Free Agent) |
| Luis Aquino | 2B | Washington |
| Stiward Aquino | RP | LA Angels |
| Ricky Aracena | SS | Kansas City |
| Bryant Aragon | 1B | San Diego |
| Tim Arakawa | 2B | LA Angels |
| Victor Arano | RP | Philadelphia |
| Elvis Araujo | RP | Miami |
| Juan Araujo | RF | Arizona |
| Pedro Araujo | RP | (Free Agent) |
| Yoel Araujo | CF | Tampa Bay |
| Harold Arauz | SP | Philadelphia |
| Jonathan Arauz | 2B | Boston |
| Yazy Arbelo | 1B | Arizona |
| Trae Arbet | SS | Pittsburgh |
| Eric Arce | LF | Toronto |
| Chris Archer | SP | Pittsburgh |
| Tristan Archer | P | Milwaukee |
| Francisco Arcia | C | (Free Agent) |
| Orlando Arcia | SS | Milwaukee |
| Taylor Ard | 1B | Seattle |
| Kevin Ardoin | P | Detroit |
| Richard Arena | SS | Toronto |
| Jonah Arenado | 3B | San Francisco |
| Nolan Arenado | 3B | Colorado |
| Orangel Arenas | SP | LA Angels |
| J.P. Arencibia | C | Tampa Bay |
| Willie Argo | OF | Tampa Bay |
| Noel Arguelles | SP | Kansas City |
| Matthew Arguello | P | Minnesota |
| Alberto Arias | RP | (Deleted) |
| Andry Arias | 1B | Washington |
| Antonio Arias | CF | NY Yankees |
| Christopher Arias | CF | LA Dodgers |
| Dayeison Arias | RP | Seattle |
| Diosbel Arias | SS | Texas |
| Elias Arias | CF | Atlanta |
| Gabriel Arias | SP | Cleveland |
| Gabriel Arias | SS | Cleveland |
| Jean Carlos Arias | CF | Minnesota |
| Jesus Arias | RP | Chicago |
| Joaquín Árias | SS | Arizona |
| Juan Carlos Arias | 3B | Tampa Bay |
| Junior Arias | SS | Cincinnati |
| Luarbert Arias | SP | San Diego |
| Roderick Arias | SS | (Minor Leagues) |
| Santos Arias | P | Minnesota |
| Skylar Arias | P | Cleveland |
| Wilkins Arias | SP | NY Yankees |
| Kevin Arico | P | Cincinnati |
| Kohei Arihara | SP | (Minor Leagues) |
| Tony Armas | SP | (Minor Leagues) |
| David Armendariz | LF | Cleveland |
| Lazaro Armenteros | LF | Oakland |
| Rogelio Armenteros | SP | Houston |
| Cole Armstrong | C | Chicago Sox |
| Jack Armstrong | P | Houston |
| Joey Armstrong | LF | Arizona |
| Mark Armstrong | P | Cincinnati |
| Shawn Armstrong | RP | Baltimore |
| Cristo Arnal | SS | Cleveland |
| Zachary Arneson | P | NY Yankees |
| Eric Arnett | SP | Milwaukee |
| Chadwick Arnold | P | LA Dodgers |
| Jonathan Aro | RP | Atlanta |
| Vince Arobio | P | Chicago Sox |
| Jeremy Arocho | SS | LA Dodgers |
| Randy Arozarena | RF | Tampa Bay |
| Luis Arraez | 2B | Minnesota |
| Bryndan Arredondo | C | Baltimore |
| Edgar Arredondo | SP | Texas |
| Jose Arredondo | RP | (Deleted) |
| Gio Arriera | P | Detroit |
| Jake Arrieta | SP | Philadelphia |
| Carlos Arroyo | LF | Texas |
| Christian Arroyo | 3B | Boston |
| Marlon Arroyo | 3B | Arizona |
| Octavio Arroyo | P | Miami |
| Rafael Arroyo | C | NY Mets |
| Aaron Arruda | 1B | Oakland |
| J.T. Arruda | SS | Washington |
| Erisbel Arruebarrena | SS | LA Dodgers |
| Aeverson Arteaga | SS | San Francisco |
| Humberto Arteaga | SS | (Free Agent) |
| DJ Artis | CF | Chicago |
| Oscar Arzaga | RP | LA Dodgers |
| DeAndre Asbury | RF | St. Louis |
| Enyerberth Ascanio | C | NY Yankees |
| Jose Ascanio | RP | LA Dodgers |
| Rayder Ascanio | SS | Seattle |
| Cody Asche | LF | Minnesota |
| Steve Ascher | P | Tampa Bay |
| Kyle Aselton | RP | Minnesota |
| Jairo Asencio | RP | (Deleted) |
| Miguel Asencio | P | (Deleted) |
| Yeison Asencio | CF | San Diego |
| Elliot Ashbeck | P | San Diego |
| Aaron Ashby | SP | Milwaukee |
| Braxton Ashcraft | SP | Pittsburgh |
| Graham Ashcraft | P | Cincinnati |
| Josh Ashenbrenner | 2B | Detroit |
| Alec Asher | RP | Minnesota |
| Zach Ashford | RF | NY Mets |
| Nevin Ashley | C | Seattle |
| Javier Assad | SP | Chicago |
| Ezequiel Astacio | P | Chicago |
| Barrett Astin | RP | Cincinnati |
| Wilfred Astudillo | C | NY Mets |
| Willians Astudillo | C | Minnesota |
| Carlos Asuaje | 2B | (Free Agent) |
| Luis Asuncion | RF | San Diego |
| Austin Athmann | C | Detroit |
| Luis Atilano | SP | Cincinnati |
| Adam Atkins | P | NY Mets |
| Garrett Atkins | 1B | (Deleted) |
| Mitch Atkins | SP | NY Mets |
| Ryan Atkinson | SP | Arizona |
| Aaron Attaway | SS | Toronto |
| William Atwood | SP | Washington |
| Michael Aubrey | 1B | Washington |
| Oscar Aude | RF | Colorado |
| Tyson Auer | CF | LA Angels |
| Bryan Augenstein | RP | Detroit |
| Mike Augliera | P | Boston |
| Joseph August | OF | NY Mets |
| Phillippe Aumont | RP | Toronto |
| Austin Aune | OF | NY Yankees |
| Chris Aure | P | Pittsburgh |
| Brett Austin | C | Chicago Sox |
| Chase Austin | SS | Miami |
| Jamal Austin | OF | Seattle |
| Jay Austin | CF | Houston |
| Jordon Austin | CF | Boston |
| Myles Austin | SS | Milwaukee |
| Trent Autry | P | Arizona |
| Drew Avans | LF | LA Dodgers |
| Abiatal Avelino | SS | (Free Agent) |
| Rodard Avelino | RP | St. Louis |
| Javier Avendano | SP | St. Louis |
| James Avery | RP | Cincinnati |
| Matt Avery | RP | Washington |
| Xavier Avery | LF | (Free Agent) |
| Alex Avila | C | Minnesota |
| Juan Avila | 3B | Miami |
| Pedro Avila | SP | San Diego |
| Rivaldo Avila | C | Boston |
| Cameron Avila-Leeper | P | San Francisco |
| Luis Avilan | RP | NY Yankees |
| Guillermo Aviles | LF | (Minor Leagues) |
| Luis Aviles | SS | Milwaukee |
| Mike Avilés | 2B | (Free Agent) |
| Robbie Aviles | SP | Cleveland |
| Freddy Avis | P | Washington |
| Dylan Axelrod | RP | Miami |
| John Axford | RP | (Free Agent) |
| Bobby Ay | P | Arizona |
| Luis Ayala | RP | Toronto |
| Manny Ayala | SP | Philadelphia |
| Sammy Ayala | C | Chicago Sox |
| Rodrigo Ayarza | 2B | Houston |
| Erick Aybar | SS | (Free Agent) |
| Willy Aybar | DH | (Deleted) |
| Yoan Aybar | RP | Boston |
| Jaime Ayende-Morales | RF | Tampa Bay |
| Daniel Ayers | P | Baltimore |
| Jose Azocar | RF | Detroit |
| Alex Azor | OF | Toronto |
| Alexeis Azuaje | 2B | Philadelphia |
| Jesus Azuaje | SS | Philadelphia |