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In 1998, Mark McGwire broke Maris' record by nine home runs. McGwire hit 70 and Maris hit 61.
Mark McGwire played for the St. Louis Cardinals in 1998 when he broke the single-season home run record of 61 held by Roger Maris. He would finish the season with 70, a record that has since been broken by Barry Bonds, who hit 73 in 2001.
Barry Bonds broke the record in the 20 century.
In 1998, St. Louis Cardinals slugger Mark McGwire hit 70 home runs to break Roger Maris' single season record.
34, days short of his 35th birthday. McGwire was born October 1, 1963 and hit his 62nd home run of the 1998 season off of Steve Trachsel of the Chicago Cubs on September 8.