According to the Pro Football Hall of Fame, as of the start of the 2007 season the team with the best all time regular season winning percentage was the Miami Dolphins whose all time regular season record was 368-252-4 for a winning percentage of .593. Second was the Chicago Bears with an all time regular season record of 670-482-42 for a winning percentage of .579.
Highest Winning Percentage, Regular Season Miami Dolphins .580 Highest Winning Percentage, Overall Dallas Cowboys .577
The Lions best regular season winning percentage came in 1953 when they had a record of 10-2 for a winning percentage of .833. The most wins the Lions had in a regular season came in 1991 when they went 12-4.
Through the 2007 season, the American League team with the most wins in a regular season was the 2001 Seattle Mariners with 116. The American League team with the best winning percentage in a regular season is the 1954 Cleveland Indians who went 111-43 for a winning percentage of .721. Seattle's record in 2001 was 116-46 for a winning percentage of .716.
As of the start of the 2008 season, the best franchise regular season winning percentage is .580 for the Miami Dolphins (369-267-4). The Dallas Cowboys are second at .578 (414-302-6).
As of the start of the 2010 season, the Cowboys have leapfrogged the Miami Dolphins. The Dolphins have a win percentage of .579 and the Cowboys have a .580 percentage.
The top winning percentage of the 1980s in the NFL was the San Francisco 49ers. They won 68.4% of their regular season games. 2nd was the Washington Redskins at 63.8%.
The Tigers best winning percentage for a regular season came in 1934 when they went 101-53 for a .656 winning percentage. They won the AL pennant but lost to the St. Louis Cardinals in the World Series. The most wins the Tigers had in a regular season is 104 in 1984. They won the AL pennant and defeated the San Diego Padres in the World Series.
The franchise's best winning percentage for a season is .623 and has been accomplished in three seasons. The 1886 Quakers had a record of 71-43 and both the 1976 and 1977 Phillies had a record of 101-61. The 1976 and 1977 teams are the only two teams in Phillies history to win 100+ games in the regular season.The franchise has had two other teams to finish with a winning percentage of .600 or better. The 1899 Phillies had a record of 94-58 for a winning percentage of .618 and the 1887 Quakers had a record of 75-48 for a winning percentage of .610.
The 1906 Chicago Cubs have the best winning percentage for a season with .763. The Cubs 1906 record was 116-36.
As of the end of the 2012 season, the Chicago Bears have the best all time regular season win % of .578
That would be the 1906 Chicago Cubs with a regular season record of 116-36 for a winning percentage of .763.
The New England Patriots have the best win percent since 2011, with a 3 season average winning percentage of .771.
Through the 2008 season, that was 1917 when they went 100-54 for a .649 winning percentage. This is the only regular season where they won 100+ games. The Sox defeated the Cincinnati Reds in the 1917 World Series.
Through the 2008 season, the best regular season winning percentage belongs to the Miami Dolphins who have an all time record of 380-272-4 for a winning percentage of .582. The Dallas Cowboys are second at .5772 (423-309-6) and the Chicago Bears are third at .5767 (686-498-42). For these winning percentages, a tie counts as half a win and half a loss.
116-46 by the 2001 Seattle Mariners, but they did not win the WS. Notably the 1906 Cubs went 116-36 which is the best winning percentage in MLB history; they also failed to win the world series. The best 162 game regular season record to win the WS was the 1998 New York Yankees who went 114-48 in the regular season and 11-2 in the post season for a total of 125-50, making them the most winning team in history.
Through the 2010 season, it's the Chicago Bears. They have a record of 704-512-42 for a winning percentage of .579.
The 1906 Cubs and the 2001 Mariners hold the record with 116 wins. Fortunately for the Cubs, they played less games giving them a higher winning percentage, which was 0.763.
The patriots. They went 16-0 in the regular season in 2008ANSWERIf you're talking about a single season, the 1972 Miami Dolphins, who went 14-0 in the regular season and won the Super Bowl. (The '08 Patriots went 16-0 in the regular season but lost the Super Bowl.)All-time, the Cowboys have the best winning percentage among existing teams. Dallas is 467-339-6, for a .579 percentage.
As of the 2013 season, the college football team that has the best winning percentage in Division 1 is Old Dominion with a winning percentage of .767. Old Dominion has only played 60 games in Division 1 though. Notre Dame is 2nd with a percentage of .733 Michigan is 3rd with a percentage of .732
Through the 2008 regular season, the team with the most NBA titles is the Boston Celtics with 16. The team with the best winning percentage is the Los Angeles Lakers at .614 (2905-1824).
Yes, they were. With a record of 67-15, the team had the fifth best winning percentage during the regular season in NBA history. They are currently slotted in the NBA finals against the Cleveland Cavaliers and are the favorites to win it all.
Ben Roethlisberger (Pittsburgh Steelers) has the best winning percentage by far.
Among existing teams, the Cowboys have the best winning percentage. As of the beginning of the 2010 season, Dallas is 467-339-6 all-time, for a .579 winning percentage.
Grand Slamwich. Hands down.