Counting only regular season games between 1999 and 2013, the teams with the most wins are :
Overall - New England 171 of 224 (76%)*
NFC only - Green Bay 147 of 224 (65%)
*If not for their abysmal 2011 season, Indianapolis would be the leader.
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Through the 2009 season, that is 104 by the 1905 team that was known as the Brooklyn Superbas. The most losses in a season the team has had since playing in Los Angeles is 99 by the 1992 team.
Chicago Cubs
San Francisco. It was formerly an NFL record for wins in a decade, but the Colts broke it last week.
The most losses by a team in NBA history was by the 1972-73 Philadelphia 76ers who had a regular season record of 9-73.
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