In MLB, Ty Cobb of the 1912 Detroit Tigers with 8 steals of home. Cobb also holds the career MLB record for steals of home with 54.
Ricky Henderson has the most steals in baseball.
As of the start of the 2008 season, the most home runs David Ortiz has hit in a season is 54 in the 2006 season.
Old Hoss Radbourn has the most wins in a single season with 59 wins in the year 1884.
The most home runs by a rookie in a season was 49. They were hit by Mark McGwire in 1987. He later broke Babe Ruth's record for a season.
Andre Dawson of the Chicago Cubs (1987) and Mark McGwire of the Oakland Athletics (1987) with 49.
Single season - Hugh Nicol in 1887 with 138 Career - Rickey Henderson with 1406
Barry Bonds has the most homeruns in a single season. His record is 73.
Ty Cobb with 54 career steals of home
Johnny Rhodes from Maryland (1992-96) with 344. He also has the ACC record for steals per game for his career (2.82), steals in a single season (110), and steals per game for a single season (3.7). See this 2012 ACC press release for reference: http://www.theacc.com/sports/m-baskbl/spec-rel/020912aaa.html
The most home runs Babe Ruth hit in a single season was 60. He did this in 1927.
Barry Bonds hit the most home runs in a single postseaon with 8 in 2002.
The current record for most steals in one NBA season is held by Alvin Robertson of the San Antonio Spurs who had 301 steals in the 1985-86 basketball season. Others have gotten close to this achievement, but Alvin still holds the record.
Barry Bonds with 73 in one season
Barry Bonds hit the most postseason home runs in a single season with 8 in 2002.