Muhammad Ali vs. Joe Frazier III — 'Thrilla in Manila' (1975)
The case
Best overall mix of elite rivalry, championship stakes, drama, and enduring cultural memory.
Best evidence
The most punishing chapter of boxing's greatest rivalry: two unbeaten-level icons pushing each other to physical and psychological limits in a fight still used as shorthand for extreme championship courage.
Muhammad Ali vs. Joe Frazier I — 'The Fight of the Century' (1971)
The case
Arguably the most socially and historically loaded boxing match ever staged.
Best evidence
A rare sports event that exceeded boxing: two undefeated heavyweight champions, political symbolism, celebrity spectacle, and a definitive Frazier victory that reshaped Ali's career arc.
Jack Dempsey vs. Luis Ángel Firpo — 'The Wild Bull of the Pampas' Fight (1923)
The case
Its visual drama and mythology helped define heavyweight boxing's early mass-entertainment era.
Best evidence
A chaotic, myth-making heavyweight title fight with one of boxing's most famous knockdown sequences: Firpo blasted Dempsey through the ropes before Dempsey returned to win.
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Sugar Ray Leonard vs. Thomas Hearns I — 'The Showdown' (1981)
The case
The best non-heavyweight candidate for combining skill, momentum swings, and legacy stakes.
Best evidence
A masterclass in tactical adjustment and elite welterweight risk: Hearns boxed brilliantly early before Leonard rallied late to stop him in a defining bout of the 1980s.