Only 2--Joe DiMaggio and ARod. Joe D only did it once, hitting 46 in 1937, and ARod twice, hitting 48 in 2005 and 54 in 2007.
AROD
arod the best player ever 57
Through the 2008 season: Season: Troy Glaus with 47 in the 2000 season. Career: Tim Salmon with 299 between 1992-2004 and 2006.
Through the 2008 season, that is Mickey Mantle with 536.
Alex rodriguez hit 35 home runs for the New York Yankees in 2008.
Through the 2008 season, AROD has a postseason batting average of .279 in 39 games. He has 41 hits in 147 at bats with 9 doubles, 7 home runs, and 17 RBIs.
Only 2--Joe DiMaggio and ARod. Joe D only did it once, hitting 46 in 1937, and ARod twice, hitting 48 in 2005 and 54 in 2007.
arod
AROD
4 home runs in 2009
arod the best player ever 57
Prior to the 2008 season, that was 1998 when the Cubs went 51-31 at home. As of this answer, the Cubs have 22 games left at home in the 2008 season and their home record is 43-16.
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.
Through the 2008 season, that is 24 in the 1999 season.
In MLB through the 2008 season, the record for home runs by a team in one season is 264 by the 1997 Seattle Mariners.
Through the 2008 season, that is Steve Balboni with 36 in 1985.