The new York Yankees
The 1906 Chicago Cubs at .763 (116-36).
Ron Guidry posted a .893 winning percentage which was the highest in baseball history by a 20 game winner.
What is a goodfielding percentage?
That is Joe McCarthy with a lifetime record of 2125-1333 for a winning percentage of .615. McCarthy managed the Chicago Cubs from 1926-1930, the New York Yankees from 1931-1946, and the Boston Red Sox from 1948-1950.
New York Yankees.
Washington baseball any league
.500 and above.
In MLB in the 2009 season, in the National League the average on base percentage was .331 and the average slugging percentage was .409. In the American League, the average on base percentage was .336 and the average slugging percentage was .428.
The 2002 Oakland Athletics hold the record for the longest Major League Baseball (MLB) winning streak by an American League (AL) team with 20 consecutive wins.