As of the 2007 season, none. The worst regular season record in NFL history was 0-14 by the 1976 Tampa Bay Buccaneers.
As of June 2014 Barry Bonds holds the record for most regular season homeruns. The record is 73 which beat Mark McGwire's record.
Through the 2012 season, the Yankees all-time regular season record is 9,862-7,493.
From 1933 through 2013, the Pittsburgh Steelers have a regular season record of 569-519-20.
The Steelers regular season record in 1988 was 5-11.
In five seasons from 1986-1990, Ryan posted a 43-38-1 regular season record. His playoff record was 0-3.
The Dallas Cowboys posted a 9-and-7 record during the 2005 regular season.
The 1972 Miami Dolphins posted a 17-0 record (regular season and playoffs).
The Saints posted an 11-and-5 record during the 2010 regular season.
The Saints posted a 7-and-9 record during the 2007 regular season.
The Dallas Cowboys posted an 11-and-5 regular-record during the 2009 season. They finished 1-1 in the postseason.
The Cowboys posted a 6-and-10 record during the 2010 regular season.
The Falcons posted a 7-and-9 record during the 2001 regular season. They did not qualify for the playoffs.
Their regular season record in 2007 was 10-6
The Bengals posted a 10-and-6 regular season record, but were eliminated from the playoffs by the New York Jets in the wild-card round.
The Dallas Cowboys posted an 8-and-8 record during the 2011 regular season.
During the 2011 regular season, the New York Yankees posted a 97-65 record.