Mark McGwire hit 583 home runs during his career.
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Mark Mcgwire hit 70 home runs in 1998, the year he broke Roger Maris' single season home run record of 61.
Sosa 66 HRs in 1998In 1998 Sammy Sosa and Mark Mcgwire were both making a run at Roger Maris' single season home run record. McGwire broke the record and finished the season with 70 home runs. Sammy Sosa hit 66.
Strawberry hit 29 HRs in 1989.
56. He led the American League in HRs that season.
Most likely Billy Williams, who hit 25 home run in his rookie season in 1961.