That would be the 1906 Chicago Cubs with a regular season record of 116-36 for a winning percentage of .763.
Barry Bonds holds the record with 762, but it is widely disputed because of many steroid usage accusations. Many say that Hank Aaron is the true home run king with 755.
Nationals
orioles 196-123
Chicago Cubs
The Chicago Cubs at the moment (6-6-08)
They're not. In fact, they finished 2010 with a 97-65 record. That was the best record in the MLB.
the angels
2001 Seattle Mariners they went 116-46.
2001 Seattle Mariners they went 116-46.
The Chicago Cubs at the moment (6-6-08)
51
1 and a lot
The New York Yankee's