On September 18, 1968, a 30-year-old Karl Mildenberger (53-5-3, 19 KOs) and a 34-year-old English boxer Henry Cooper (36-13-1, 25 KOs) met in the ring in a heavyweight bout.
Mildenberger came in to the fight on a 1-fight losing streak with a 31% KO rate, and was fighting after a gap of 5 months and 13 days. Cooper was on a 3-fight win streak with a 50% KO rate, and fighting after a layoff of 10 months and 11 days.
Henry Cooper defeated Karl Mildenberger via disqualification in the 15-round heavyweight fight. Cooper improves his record to 37-13-1, while Mildenberger adds a loss to his record at 53-6-3.
On April 5, 1968, a 30-year-old Karl Mildenberger (53-4-3, 19 KOs) and a 29-year-old American boxer Leotis Martin (24-3, 14 KOs) met in the ring.
Mildenberger came in to the fight on a 1-fight win streak with a 31% KO rate, and was fighting after a gap of 3 months and 6 days. Martin was on a -2-fight win streak with a 51% KO rate, and fighting after a layoff of 4 months and 9 days.
Leotis Martin stopped Karl Mildenberger via KO in the 7th round. Martin improves his record to 25-3 (15 KOs), while Mildenberger adds a loss to his record at 53-5-3.
On September 16, 1967, a 29-year-old Karl Mildenberger (52-3-3, 19 KOs) and a 24-year-old Argentinian boxer Oscar Bonavena (30-3, 25 KOs) met in the ring.
Mildenberger came in to the fight on a 3-fight win streak with a 32% KO rate, and was fighting after a gap of 4 months and 10 days. Bonavena was on a 9-fight win streak with a 75% KO rate, and fighting after a layoff of 1 month and 11 days.
Oscar Bonavena defeated Karl Mildenberger via unanimous decision in the 12-round fight. Bonavena improves his record to 31-3, while Mildenberger adds a loss to his record at 52-4-3.
On September 10, 1966, a 28-year-old Karl Mildenberger (49-2-3, 17 KOs) got a shot at the heavyweight WBC title held by 24-year-old American boxer Muhammad Ali (25-0, 20 KOs).
Mildenberger came in to the fight on a 8-fight win streak with a 31% KO rate, and was fighting after a gap of 2 months and 26 days. Ali was on a 25-fight win streak with a 80% KO rate, and fighting after a layoff of 1 month and 4 days.
Muhammad Ali stopped Karl Mildenberger via TKO in the 12th round of the 15-round world-title fight, and successfully defended his WBC and The Ring heavyweight titles. Ali improves his record to 26-0 (21 KOs), while Mildenberger adds a loss to his record at 49-3-3.
On February 24, 1962, a 24-year-old Karl Mildenberger (30-1, 13 KOs) and Dick Richardson met in the ring.
Mildenberger came in to the fight on a 19-fight win streak with a 41% KO rate, and was fighting after a gap of 1 month and 4 days.
Karl Mildenberger lost to Dick Richardson via KO in the 1st round, and adds a loss to his record at 30-2.
On November 7, 1959, a 21-year-old Karl Mildenberger (11-0, 4 KOs) and Helmut Ball met in the ring.
Mildenberger came in to the fight on a 11-fight win streak with a 36% KO rate, and was fighting after a gap of 4 months and 3 days.
Karl Mildenberger lost to Helmut Ball via KO in the 7th round, and adds a loss to his record at 11-1.