Most Memorable Knockouts in Heavyweight Boxing History

Marciano ended a 15-year unbeaten streak with a sudden right cross in the 13th round. This knockout stands as one of the most dramatic upsets in boxing history, proving that relentless pressure could topple a skilled veteran.

Known as the 'Phantom Punch,' Ali delivered a left hook that dropped Liston before he even saw the shot. The controversy over whether it was a punch or a slap adds to the mystery and enduring legend of this heavyweight classic.

Foreman's brutal power was on full display as he knocked out Frazier in just two rounds. This fight showcased Foreman's terrifying strength and established him as an unstoppable force in the heavyweight division during the early 70s.

Holyfield became the first former light heavyweight champion to win a heavyweight title by dropping Moorer with a devastating left hook. The punch came from his signature southpaw stance, shocking the boxing world and cementing his legacy.

In the first heavyweight title fight in 18 years, Bowe knocked out Douglas with a right hand in the sixth round. The victory restored prestige to the heavyweight division and marked a significant moment in the sport's modern era.

Lewis suffered a shocking defeat but redeemed himself by knocking out McCall with an uppercut in the second round of their rematch. The immediate turnaround and violent finish highlighted Lewis's resilience and superior power compared to the earlier fight.

Tyson knocked out Spinks in just 91 seconds, the shortest heavyweight title fight in history. The sheer dominance and speed demonstrated by Tyson left spectators and critics in awe of his terrifying potential at his prime.

Foreman suffered his first professional knockout loss when Norton dropped him with a powerful right hand. This upset shattered Foreman's invincibility aura and proved that even the most dominant champions could be vulnerable to technical skill.

Holyfield ended Smith's undefeated record with a knockout in the 11th round, avenging a previous split decision loss. The victory was crucial for Holyfield's comeback and demonstrated his ability to handle powerful punchers effectively.

Lewis knocked out Tua with a single right hand in the third round, showcasing his precision and power. Despite Tua's durability, the fight highlighted Lewis's technical superiority and his ability to finish opponents efficiently.

Cooper dropped Ali with a sharp left hook in the second round, nearly ending the young contender's career. Although Ali recovered to win, this knockout moment remains one of the most dramatic near-upsets in boxing folklore.

Fury knocked out Wilder with a left hook in the 11th round, claiming the WBC heavyweight title. The victory was historic as Fury overcame adversity and mental health struggles to defeat one of the most powerful punchers of his generation.

Bowe knocked out Bentt in the first round, signaling his arrival as a major force in the heavyweight division. The swift victory demonstrated Bowe's amateur pedigree and his ability to capitalize on opponents' mistakes quickly.

Holmes knocked out Tucker in the 14th round to retain his WBC title, showcasing his enduring stamina and skill. The fight highlighted Holmes' ability to adapt and maintain dominance well into his late 30s.

Williams knocked out the heavy favorite Francis to earn a shot at Klitschko, though he later lost to Klitschko himself. This upset demonstrated the volatility of the heavyweight division and the potential for underdogs to succeed with big punches.

Douglas knocked out Tyson with a series of right hands in the tenth round, shocking the world with a 42-1 upset. This remains the greatest upset in boxing history, proving that preparation and heart can overcome perceived invincibility.

Williams knocked out Ruiz in the eighth round to win the IBF heavyweight title, dethroning one of the most durable champions. The victory showcased Williams' power and his ability to capitalize on Ruiz's fatigue and vulnerabilities.

Fury knocked out Povetkin in the seventh round, retaining his WBC heavyweight title after a challenging bout. The victory demonstrated Fury's adaptability and resilience against a dangerous counter-puncher in dangerous weather conditions.

Klitschko knocked out Povetkin in the fourth round to unify the heavyweight titles, ending a long drought. The victory restored Klitschko's status as a dominant force and proved his power when he was considered past his prime.

Lewis knocked out Klitschko in the 12th round with a combination that left the Ukrainian champion unable to continue. The fight was a technical masterclass and solidified Lewis's legacy as one of the best heavyweight champions of all time.

Tyson knocked out Seldon in 1:58 of the first round, marking his return to the ring after incarceration. The swift and dominant victory reminded the world of Tyson's terrifying power and his ability to intimidate opponents instantly.