Detroit Lions 0-16
ANSWER
If you're talking about all-time winning percentages among current NFL teams, it's the Houston Texans, who were 49-79 all-time (.383) going into the 2010 season.
The 1988 San Francisco 49ers, the 2007 New York Giants and the 2010 Green Bay Packers all had a 10 - 6 regular season record and won the Super Bowl.
new Orleans saints or the jacksonville jaguars
st Louis browns
2010-11 Celtic
That would be the 1899 Cleveland Spiders (National League) whose record was 20-134.
colts
The 1988 San Francisco 49ers, the 2007 New York Giants and the 2010 Green Bay Packers all had a 10 - 6 regular season record and won the Super Bowl.
The Houston Texans, with a record of 2-14, had the worst season in the 2013 NFL regular season.
new Orleans saints or the jacksonville jaguars
Pittsburgh
because its the steelers vs the seahaws.. and the seahawks suck!!!
The 1956 team had the worst overall record in Yankees history. This was followed by the 1972 team.
2008 Detroit Lions: 0-16
st Louis browns
88
2010-11 Celtic
Bruins