Barry Bonds broke the record in the 20 century.
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Mark McGwire hit 70 home runs in 1998 to break Roger Maris' single season home run record of 61 home runs set in 1961.
In 1998, Mark McGwire broke Maris' record by nine home runs. McGwire hit 70 and Maris hit 61.
According to CNN and AP, Mark McGwire admitted on Jan. 11, 2010, to being on steroids when he broke Roger Maris' home run record in 1998.
Roger Maris hit 61 Home Runs in 1961.
In 1998, St. Louis Cardinals slugger Mark McGwire hit 70 home runs to break Roger Maris' single season record.
None, both played in seasons that had 162 game schedules. Maris hit his 61st home run in the Yankees' 162nd game of the 1961 season. McGwire hit his 62nd home run in the Cardinals' 144th game of the 1998 season.