As of the 2009 season, Barry Bonds still holds the single seaon home run record with 73.
Hank Aaron
When Barry Bonds broke the home run record.
Mark McGwire had 70 in 1998
As of now, the records state that Barry Bonds broke Aaron's career home run record.
No only the hearts of hall of fame voters and baseball fans around the world
Usually. When Barry Bonds broke Hank Aaron's all time home run record, the balls that were used when he was at bat had a number printed on them. The number on the ball that Bonds hit for the record breaking home run was 138.
Mark McGwire broke Roger Maris' record in 1998, when he hit 70 home runs.
Barry Bonds
Barry Bonds broke the record in the 20 century.
He broke Hank Aaron's all-time home run record on August 7, 2007
Barry Bonds set the single season home run record with 73 home runs in 2001.
Barry Bonds