Aug 4 - Tigers shortstop Neifi Perez is suspended for 80 games after testing positive a third time for stimulants.
Dec 13 - Former U.S. Senator George Mitchell releases 409-page report on performance-enhancing drugs in baseball that implicates seven MVPs and 31 All-Stars including Roger Clemens, Gary Sheffield, Jason Giambi, Eric Gagne, Andy Pettitte and Miguel Tejada.
Feb 9 - Alex Rodriguez tells ESPN he used banned substances while playing with the Texas Rangers from 2001-03 to justify his 10-year, $252 million contract.
Feb 11 - Miguel Tejada becomes the first high-profile player convicted of a crime stemming from baseball's steroids era, pleading guilty in federal court to misleading Congress about the use of performance-enhancing drugs.
April 8 - Manny Ramirez retires from baseball after a second positive test, an infraction that would have carried a 100-game suspension. He was suspended for 50 games for a 2009 positive.
April 13 - Barry Bonds is convicted by a federal court jury of one count of obstructing justice in a investigation into his possible use of steroids and HGH but a mistrial was declared on three perjury charges.
Aug 18 - Mike Jacobs, a minor leaguer who had played over 500 games in the major leagues, was the first professional baseball player to test positive for banned human growth hormone.
Feb 23 - Reigning National League MVP Ryan Braun becomes the first major-leaguer to win an appeal of a positive test as his 50-game suspension is overturned on appeal because of questions over the handling of the test sample.
Aug 15 - San Francisco Giants outfielder Melky Cabrera, the All-Star game MVP, is suspended for 50 games after testing positive for banned testosterone.
July 22 - Braun suspended for 65 games for "violations of the Basic Agreement and its Joint Drug Prevention and Treatment Program."
Aug 5 - MLB suspends Alex Rodriguez for 211 games, through to the end of the 2014 season, over the Biogenesis scandal.
Aug 5 - MLB suspended 12 other players for 50 games. They were: Texas Rangers outfielder Nelson Cruz, San Diego Padres shortstop Everth Cabrera, Detroit Tigers shortstop Jhonny Peralta, Philadelphia Phillies reliever Antonio Bastardo, New York Mets outfielder Jordany Valdespin, Yankees catcher Francisco Cervelli, Seattle Mariners catcher Jesus Montero, New York Mets outfield prospect Cesar Puello, San Diego Padres pitching prospect Fautino De Los Santos, Houston Astros pitching prospect Sergio Escalona and New York Yankees outfield prospect Fernando Martinez.
(Compiled Gene Cherry; editing by Julian Linden)