Top 5 Biggest Professional Sports Upsets

#2 because the final validated order places "Buster Douglas defeats Mike Tyson" here with 73 framework points. It trails #1 "Leicester City win the 2015–16 Premier League" by 4 points. It is placed above #3 "New York Giants defeat the unbeaten New England Patriots in Super Bowl XLII" by the deterministic evidence, prompt-fit, source-count, and title tie-breaks.

ESPN's historical account records both the line and the knockout result.

Douglas was an accomplished heavyweight and Tyson's preparation was visibly poor, making the matchup less random than its reputation suggests.

#3 because the final validated order places "New York Giants defeat the unbeaten New England Patriots in Super Bowl XLII" here with 73 framework points. It follows #2 "Buster Douglas defeats Mike Tyson" after those deterministic tie-breaks. It leads #4 "Boston Red Sox overturn a 3–0 ALCS deficit against the New York Yankees" by 4 points.

NFL game notes record the Patriots' 18–0 entry and the Giants' late winning touchdown.

The upset's cultural force exceeds its betting magnitude; other Super Bowls, especially Jets–Colts in Super Bowl III, involved longer point spreads.

#4 because the final validated order places "Boston Red Sox overturn a 3–0 ALCS deficit against the New York Yankees" here with 69 framework points. It trails #3 "New York Giants defeat the unbeaten New England Patriots in Super Bowl XLII" by 4 points. It is placed above #5 "New York Mets win the 1969 World Series" by the deterministic evidence, prompt-fit, source-count, and title tie-breaks.

The Baseball Hall of Fame documents that the Red Sox completed the first 0–3 comeback in MLB postseason history.

The Red Sox were a talented 98-win team, so the result is more an unprecedented series reversal than a classic mismatch.

#5 because the final validated order places "New York Mets win the 1969 World Series" at the publication cutoff with 69 framework points. It follows #4 "Boston Red Sox overturn a 3–0 ALCS deficit against the New York Yankees" after those deterministic tie-breaks.

MLB's account of the club's 1969 celebration gives the preseason odds.

Their postseason victory over Baltimore was startling, but their full-season turnaround was less improbable than a one-game upset of a dominant favorite.