bonds 73 home runs
Barry Bond
Barry Bonds* Holds both records. He broke Hank Aaron's record of homers in 2007 and has 762 and broke McGwire's single-season record in 2001 and has 73. But note the asterisk.
AL - Seattle, 1997, 264 HRs NL - Houston, 2000, 249 HRs
No. Major League Baseball would be opening a can of worms if it tried to decide which home run records are valid or invalid.
Hank Aaron - Roger MarisBabe Ruth had two Major home records broken. The single season home run record and the all time career home run record. Roger Maris hit 61 home runs in 1961 to break Babe Ruth's single season home run record of 60, that he set in 1927. In 1974 Hank Aaron hit his 715th career home run to break Babe Ruth's all time record of 714.
roger maris
Prince Fielder with 50
Barry Bond
Barry Bonds
Mark McGwire set the single season home run record with 70 but was broken three years later by Barry Bonds. Also, the New York Yankees set the single season win record by a team with 125 (114 regular season, 11 postseason.)
Roger Maris 61 in '61Roger Maris hit 61 home runs in 1961 breaking Babe Ruth single season home run record of 60 set in 1927.
Mark Mcgwire hit 70 home runs in 1998, the year he broke Roger Maris' single season home run record of 61.