The NBA team that has the worst winning percentage right now is the Sacramento Kings. There winning percentage is .217 and there record is 15-54. They are currently 26 and 1/2 games back from making the playoffs in the Western Conference, and 39 1/2 games back of the first place Los Angele Lakers.
The Washington Capitals had an NHL record .131 points percentage in the 1974-75 season, earning only 21 points (8 wins, 67 losses, 5 ties) in 80 games.
Through the 2008 season, the Tampa Bay Rays have the worst lifetime winning percentage of any MLB team with .417 (742-1037).
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In 1979, the worst Super Bowl team was the Los Angeles Rams. They went in to the playoffs with a winning percentage of 9 to 7.
The team with the worst winning percentage in the history of MLB -- the 1899 Cleveland Spiders -- still managed to win 20 games out of the 154 they played that year. This dismal .130 winning percentage is so bad that it is extremely unlikely that any MLB team will do worse. The 1916 Philadelphia Athletics -- the third worst team in MLB history -- had a .235 winning percentage, 100 points better than the Spiders.
Through the 2007 season, the team with the worst winning percentage on MNF is the Cardinals with a record of 5-12-1 for a winning percentage of .277. The Falcons are second worst at 9-21 for a winning percentage of .300. The Bears are third worst at 16-34 for a winning percentage of .320. The Bears 34 losses is the most of any team on MNF.
As of the start of the 2008 season, the Philadelphia Philles have lost the most games in MLB history. Their franchise record is 8853-10028 for a winning percentage of .469. The team with the worst franchise winning percentage is the Tampa Bay Rays who have a record of 645-972 for a winning percentage of .399.
In 1912 when the team was called the Highlanders, the team record was 50 - 102. for a .329 winning percentage. Since the team was named the Yankees in 1913 the worst season was 1913 with a record of 57 - 94 for a .377 winning percentage.
Former NBA Vancouver Grizzlies. : From 1995 to 2001 these pathetic "athletes" compiled a record of 101 wins and a staggering 359 losses for a winning percentage of 21.9% : Case closed!
Seattle Seahawks .500
The Detoit Lions went 0-16 in the 08-09 season
As far as winning percentage goes, that was the 1916 Philadelphia Athletics at .235 (record of 36-117). Second worst was the 1935 Boston Braves at .248 (38-115) and third worst was the 1962 New York Mets at .250 (40-120).
For football head coaches, that is Joe Kuharich who coached the team between 1959-1962. His four season record was 17-23 for a winning percentage of .425.