No player has ever hit 400 home runs in a single season. The record is 73 set by Barry Bonds in 2001.
Never
Roger Maris hit 61 home runs in the 1961 season.
Yastrzemski, Carl (1)
No ... the most home runs Cobb hit in a season was 12 in 1921 and 1925.
The most home runs Hank Aaron hit in one season was 47, in 1971.
1
Never
In MLB, that was Babe Ruth who hit 54 home runs in 1920.
On October 4, 2009, in the last Yankees last regular season game, Alex Rodriguez hit two home runs (team #'s 243 and 244).In this game against the Tampa Bay Rays, Rodriguez hit both of his home runs in the sixth inning. The first was a three-run homer and the second was a grand slam. This gave A-Rod 30 home runs and 100 runs batted in for the season.
5
Sammy Sosa's last game was on September 29, 2007. He ended the 2007 season with 21 home runs.
As of the 2008 season, that would be Bobby Higginson who hit 30 HRs in 2000.
The Boston Braves. He had 72 AB's that season and hit 6 home runs.
For the 2008 season, that was Ryan Howard of the Phillies with 48.
16 men have hit 4 home runs in a single game. The last was hit by Josh Hamilton this season against the Baltimore orioles.
Roger Maris hit 61 home runs in the 1961 season.
Yastrzemski, Carl (1)