The MLB team with the longest undefeated record in history is the 1916 New York Giants, who went 26 games without a loss.
Fau
The Philidelphia Flyers went undefeated for a 35 game stretch in the 1979-80 season.
Arsenal FC's longest streak was when they won the 2003-2004 English Premier League Season with an unbeaten record (38 games).
Would a late 2005 to 2008 undefeated record, about 50 games, be close?
usc
As of October 2023, the last college baseball team to finish a season undefeated was the 2010 University of South Carolina team, which completed the season with a record of 54-16 and won the College World Series. Their achievement was notable, as it marked a significant accomplishment in college baseball history, showcasing their dominance throughout the season and in postseason play. Undefeated seasons are rare in college baseball due to the competitive nature of the sport.
In 1989, The UCLA Bruins won the College World Series. They went undefeated in this series. They finished their season with a record of 48-4.
new England
Yes, they went undefeated in 1907 with a record of 3-0.
Should Notre Dame defeat Alabama in the FBS Championship Game played January 7, 2013 he will have his third undefeated season as a college coach. He coached Grand Valley State to a 14-0 record in 2002 and the University of Cincinnati to a 12-0 record in 2009.
Kentucky leads the overall series 27-14.