73 home runs.
Barry Bonds hit them in 2001.
Barry Bonds set the single season home run record with 73 home runs in 2001.
No. Major League Baseball would be opening a can of worms if it tried to decide which home run records are valid or invalid.
No player has ever hit 400 home runs in a single season. The record is 73 set by Barry Bonds in 2001.
In 1998, St. Louis Cardinals slugger Mark McGwire hit 70 home runs to break Roger Maris' single season record.
Through the 2007 MLB season: The single season MLB record for walks is held by Barry Bonds who was walked 232 times in the 2004 season. The career MLB record for walks is held by Barry Bonds who has been walked 2558 times during his career.
Lionel Messi holds the record for scoring the most goals in a single season in the Champions League.
Sergio Agero holds the record for the most Premier League hat tricks in a single season.
Barry Bonds who uses steroids
Barry Bonds set the single season home run record with 73 home runs in 2001.
Career and Single Season RBI LeadersHank Wilson of the Chicago Cubs holds the major League record for RBIs in a single season with 191 hit in 1930. New York Yankees, Lou Gehrig holds the American League record for RBIs in a single season with 184 in 1931. Hank Aaron holds the Major League record for career RBIs with 2,297 and the National League record with 2,202. Babe Ruth is second in career RBIs with 2,218, and hold the American League career RBI record with 2,201.
The Premier League record points total achieved by a team in a single season is 100 points, achieved by Manchester City in the 2017-2018 season.
The record for the most points earned by a team in a single Premier League season is 100 points, achieved by Manchester City in the 2017-2018 season.
The team that holds the record for scoring the most goals in a single season in the UEFA Champions League is FC Barcelona.
Adam Dunn
If you're talking about the Modern Era (1900 to present) then it would be Roger Maris.
Lou Gehrig holds the American League single season record for RBIs with 184 in 1931.
That is Lou Gehrig with 184 RBIs in the 1931 season.