The teams that have won the most games in one season are the 2001 Seattle Mariners in 2001 and the Chicago Cubs in 1906 with 116 wins each. The real question though is who has the best winning percantage because in 1906 there were 10 less games which could have been recored as wins if they were played. The 1906 Chicago Cubs have a winning percentage of .763% and the 2001 Seattle Mariners have a winning percentage of .716% which is worse.
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The 1998 New York Yankees, with 125 including their 11-1 postseason record. The most wins in the regular season was achieved twice with 116: by the Chicago Cubs in 1906 and the Seattle Mariners in 2001.
Through the 2011 season, the San Francisco Giants have the most all-time wins with 10,522.
San Francisco Giants. 10,568.
http://www.Baseball-reference.com/ is the best source for baseball facts and trivia
Yankees
Giants. 10,568. Yankees are 8th at 9,817
The most wins in a season before the schedule was increased to 162 games was by the 1906 Chicago Cubs who won 116 games. This is still the record for most wins in an MLB regular season. It was tied in 2001 by the Seattle Mariners.
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As of 2011, the New York Yankees have won the most World Series, capturing the trophy 27 times.