As of November '09 the St. Louis Rams are the worst team.
Raiders
The Houston Texans, with a record of 2-14, had the worst season in the 2013 NFL regular season.
The worst team in the league would be the one that was bottom of the league in that particular season.
The 1956 team had the worst overall record in Yankees history. This was followed by the 1972 team.
The Washington Nationals
No they are not for the 2009-2010 season. The worst team in the NBA is the New Jersey Nets. They have only won $ games in only 41 games in the season.
The Saint Louis Rams had the worst record in the 2009-2010 season, they ended their season 1-15.
Pittsburgh
0-16 in 2008 season worst of any team all-time
The team that finishedwith the worst recordin the previous season.
Detroit lions