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.
Chuck Noll was the winningest head coach on the Steelers with a combined 209 wins and 156 losses. His regular season record was 193-148-1. Postseason was 16-8. Bill Cowher had the highest regular season winning percentage at .623 (149-90-1).
Derek Jeter
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 2008 season, the Tampa Bay Rays have the worst lifetime winning percentage of any MLB team with .417 (742-1037).
As of the end of the 2010 season, the Detroit Lions all-time win loss record is 496-593-32 with a .456 winning percentage.
New york yankees
Peyton Manning has the most NFL regular and postseason wins as of 2016, with 200. He surpassed Brett Farve who had 199 total wins by winning Super Bowl 50 against the Panthers.
Through Super Bowl XLII, that would be the Carolina Panthers at 6-3 for a winning percentage of .667 and the Baltimore Ravens at 5-3 for a winning percentage of .625. For teams that have been around a little longer than the Panthers and Ravens, it would be the New England Patriots at 21-13 for a winning percentage of .618 and the Green Bay Packers at 24-15 for a winning percentage of .615.
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
Chuck Noll was the winningest head coach on the Steelers with a combined 209 wins and 156 losses. His regular season record was 193-148-1. Postseason was 16-8. Bill Cowher had the highest regular season winning percentage at .623 (149-90-1).
John Madden spent 10 years (1969-1978) as a head coach, all with the Oakland Raiders. His career record is 112-39-7 (103-32-7 in the regular season and 9-7 in the postseason). That works out to a winning percentage of .731.
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.
MIKE HOLMGREN157-100-0 (Regular Season)13-11 (Postseason)170-111-0 (Overall)
John Elway
Derek Jeter
Tom Osborne's regular season record in his 25 seasons as head coach of the University of Nebraska was 255-49-3 for a winning percentage of .836. His record in bowl games was 12-13 for a winning percentage of .480.