The AL rookie home run record is held by Mark McGwire who hit 49 home runs for the Oakland Athletics in 1987.
Cal Ripken Jr. holds the Oriole Home Run record with 18 in 1982, also earning him the AL Rookie Of The Year Award.
Mark McGwire with 49 in 1987 for the Oakland Athletics.
Barry Bonds holds the record with 762 home runs.
Barry Bonds holds the single season home run record with 73 set in 2001, and holds the record for career home runs with 762, set in 2007.
The MLB National League rookie home run record is jointly held by Wally Berger, who knocked 38 out of the park in his first season with the Boston Braves in 1930, and by Frank Robinson, who matched that feat in his debut with the Cincinatti Reds in 1956. Berger was 25 when he set the mark, older than the average rookie. Robinson was 21.
Darryl Strawberry with 262 home runs
Most likely Billy Williams, who hit 25 home run in his rookie season in 1961.