On October 30, 1974, a 32-year-old Muhammad Ali (44-2, 31 KOs) got a shot at the undisputed heavyweight championship held by 25-year-old George Foreman (40-0, 37 KOs).
Ali came in to the fight on a 3-fight win streak with a 67% KO rate, and was fighting after a gap of 9 months and 2 days. Foreman was on a 40-fight win streak with a 92% KO rate, and fighting after a layoff of 7 months and 4 days.
Muhammad Ali stopped the champion via KO in the 8th round, and wins the WBA, WBC, and The Ring titles — and is crowned the new undisputed heavyweight world champion. Ali improves his record to 45-2 (32 KOs), while Foreman adds a loss to his record at 40-1.
On February 25, 1964, a 22-year-old Muhammad Ali (19-0, 15 KOs) got a shot at the undisputed heavyweight championship held by 31-year-old Sonny Liston (35-1, 25 KOs).
Ali came in to the fight on a 19-fight win streak with a 78% KO rate, and was fighting after a gap of 8 months and 7 days. Liston was on a 28-fight win streak with a 69% KO rate, and fighting after a layoff of 7 months and 3 days.
The champion refused to continue the fight in the 6th round, and Muhammad Ali is crowned the new WBA, WBC, and The Ring heavyweight world champion — and becomes the undisputed heavyweight world champion — in his first world-title fight. Ali improves his record to 20-0 (16 KOs), while Liston adds a loss to his record at 35-2.
On November 21, 1972, a 30-year-old Muhammad Ali (39-1, 30 KOs) and a 30-year-old Bob Foster (49-5, 42 KOs) met in the ring in a heavyweight bout.
Ali came in to the fight on a 8-fight win streak with a 75% KO rate, and was fighting after a gap of 2 months and 1 day. Foster was on a 8-fight win streak with a 77% KO rate, and fighting after a layoff of 1 month and 26 days.
Muhammad Ali stopped Bob Foster via KO in the 8th round. Ali improves his record to 40-1 (31 KOs), while Foster adds a loss to his record at 49-6.
On May 25, 1965, Muhammad Ali and Sonny Liston met again in an immediate rematch.
Ali came in to the fight on a 20-fight win streak with a 80% KO rate, and was fighting after a gap of 1 year and 3 months. Liston was on a -1-fight win streak with a 67% KO rate, and fighting after a layoff of 1 year and 3 months.
Muhammad Ali made quick work of Sonny Liston in the rematch, stopping the challenger via KO in the 1st. Ali improves his record to 21-0 (17 KOs), while Liston adds a loss to his record at 35-3.
On September 15, 1978, Muhammad Ali and Leon Spinks met again in an immediate rematch.
Ali came in to the fight on a 1-fight losing streak with a 63% KO rate, and was fighting after a gap of 7 months. Spinks was on a 2-fight win streak with a 62% KO rate, and fighting after a layoff of 7 months.
Muhammad Ali defeated Leon Spinks via unanimous decision in the rematch and wins the WBA and The Ring titles. Ali improves his record to 56-3, while Spinks adds a loss to his record at 7-1-1.
On November 14, 1966, the 24-year-old WBC and The Ring heavyweight world champion, Muhammad Ali (26-0, 21 KOs), faced a 33-year-old Cleveland Williams (65-5-1, 51 KOs), in a title defense fight.
Ali came in to the fight on a 26-fight win streak with a 80% KO rate, and was fighting after a gap of 2 months and 4 days. Williams was on a 9-fight win streak with a 71% KO rate, and fighting after a layoff of 4 months and 17 days.
Muhammad Ali made easy work of Cleveland Williams, stopping the challenger via TKO in the 3rd. Ali improves his record to 27-0 (22 KOs), while Williams adds a loss to his record at 65-6-1.
On August 6, 1966, the 24-year-old WBC and The Ring heavyweight world champion, Muhammad Ali (24-0, 19 KOs), faced Brian London, in a title defense fight.
Ali came in to the fight on a 24-fight win streak with a 79% KO rate, and was fighting after a gap of 2 months and 16 days.
Muhammad Ali made easy work of Brian London, stopping the challenger via KO in the 3rd. Ali improves his record to 25-0 (20 KOs)
On May 21, 1966, Muhammad Ali and Henry Cooper met again in a rematch.
Ali came in to the fight on a 23-fight win streak with a 78% KO rate, and was fighting after a gap of 1 month and 22 days. Cooper was on a 2-fight win streak with a 51% KO rate, and fighting after a layoff of 3 months and 5 days.
In the rematch, Muhammad Ali stopped Henry Cooper via TKO in the 6th round of the 15-round world-title fight, and successfully defended his WBC and The Ring heavyweight titles. Ali improves his record to 24-0 (19 KOs), while Cooper adds a loss to his record at 33-12-1.
On February 20, 1976, the 34-year-old undisputed heavyweight world champion, Muhammad Ali (49-2, 35 KOs), faced a undefined Jean-Pierre Coopman undefined in an undisputed title defense fight.
Ali came in to the fight on a 8-fight win streak with a 68% KO rate, and was fighting after a gap of 4 months and 19 days.
Muhammad Ali stopped Jean-Pierre Coopman via KO in the 5th round of the 15-round world-title fight, and successfully defended his WBA, WBC, and The Ring heavyweight titles. Ali improves his record to 50-2 (36 KOs)
On May 24, 1976, the 34-year-old undisputed heavyweight world champion, Muhammad Ali (51-2, 36 KOs), faced a undefined Richard Dunn undefined in an undisputed title defense fight.
Ali came in to the fight on a 10-fight win streak with a 67% KO rate, and was fighting after a gap of 24 days.
Muhammad Ali stopped Richard Dunn via TKO in the 5th round of the 15-round world-title fight, and successfully defended his WBA, WBC, and The Ring heavyweight titles. Ali improves his record to 52-2 (37 KOs)