Top 10 biggest upsets in NFL history

   In the final game before 
  [the AFL-NFL merger](, the 
  [Chiefs](/teams/kansascitychiefs/profile?team=KC) pulled off the upstart league's second straight upset win over the established NFL. 
   Not many believed that the 
  [Vikings](/teams/minnesotavikings/profile?team=MIN) could beat a 
  [49ers](/teams/sanfrancisco49ers/profile?team=SF) team that finished 13-2, and featured Joe Montana at his peak and a rising WR in Jerry Rice. 
   Behind backup QB Jeff Hostetler, the 
  [Giants](/teams/newyorkgiants/profile?team=NYG) put together a game plan for success against the high-flying 
  [Bills](/teams/buffalobills/profile?team=BUF) in this edge-of-your-seat thriller. 
   When replacement players were used during a strike in the 1987 season, the 
  [Redskins](/teams/washingtonredskins/profile?team=WAS)' final replacement game helped inspire a movie. 
   One year removed from their inaugural season, the expansion 
  [Jaguars](/teams/jacksonvillejaguars/profile?team=JAC) went into Mile High Stadium and shocked the football world. 
   A year after the 
  [shocking upset against the Jaguars](, the 
  [Broncos](/teams/denverbroncos/profile?team=DEN) pulled off one of their own against the defending 
  [Super Bowl]( champion 
   Fresh from a move from the fledgling All-American Football Conference, the rogue 
  [Browns](/teams/clevelandbrowns/profile?team=CLE) dominated the two-time defending NFL champion 
   Before he married a supermodel and was a national icon, 
  [Tom Brady](/player/tombrady/2504211/profile) was a relative unknown leading the 
  [Patriots](/teams/newenglandpatriots/profile?team=NE) to 
  [an improbable Super Bowl win]( 
  [Patriots](/teams/newenglandpatriots/profile?team=NE) steamrolled to an 18-0 record en route to 
  [Super Bowl XLII](, where the 
  [Giants](/teams/newyorkgiants/profile?team=NYG) prevented New England's pro football immortality. 
   Joe Namath made a famous guarantee before 
  [Super Bowl]( III, but not many believed the AFL's 
  [Jets](/teams/newyorkjets/profile?team=NYJ) could even match up with the NFL's 

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