For pitchers, that is Alexander Spaulding who pitched between 1871-1877 for the Boston Red Stockings of the National Association and the Chicago White Stockings of the National League and had a won-loss record of 253-65 for a winning percentage of .796.
For pitchers that played after 1900, that is Spud Chandler who pitched for the New York Yankees between 1937-1947 and had a won-loss record of 109-43 for a winning percentage of .717.
For teams, through games played on April 15, 2009, that is the New York Yankees with a won-loss record of 9,476-7,239 for a winning percentage of .567.
51
Through the 2009 season, the record for a season is 4,483,350 by the 1993 Colorado Rockies.
1 and a lot
The Cincinnati Reds have the highest winning percentage against them. The Reds are 5-4 all time against the Yankees.
The Chicago White Sox, after the 2006 interleague play. Oakland had it going into this year.
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.
Kenny Lofton
2001 Seattle Mariners they went 116-46.
The Chicago Cubs at the moment (6-6-08)
51
Through the 2009 season, the record for a season is 4,483,350 by the 1993 Colorado Rockies.