American football rules
Super Bowl LI was the first Super Bowl to go into overtime with a 28-all tie between the Atlanta Falcons and New England Patriots, which the Patriots eventually won with James White scoring a touchdown on the Patriots' first drive.
2007 NFL season
The New England Patriots became the first team to complete the regular season undefeated since the league expanded to a 16-game regular season in 1978. Four weeks after the playoffs began on January 5, 2008, the Patriots' bid for a perfect season was dashed when they lost to the New York Giants in Super Bowl XLII, the league championship game at University of Phoenix Stadium in Glendale, Arizona on February 3, by a score of 17–14.