Karl Mildenberger has six losses against six opponents on his boxing record. For a list of Mildenberger's best fights, refer to "Best fights of Karl Mildenberger".
On September 18, 1968 Karl Mildenberger faced off against Henry Cooper in a heavyweight bout at age 30. He was coming in with a record of 53-6-3 (19), and Cooper was 34 years old and with a record of 36-13-1 (25). Mildenberger lost the fight via 8-round disqualification.
On April 5, 1968 Karl Mildenberger faced off against Leotis Martin at age 30. He was coming in with a record of 53-5-3 (19), and Martin was 29 years old and with a record of 24-3 (14). Mildenberger lost the fight via 7th-round KO.
On September 16, 1967 Karl Mildenberger faced off against Oscar Bonavena at age 29. He was coming in with a record of 52-4-3 (19), and Bonavena was 24 years old and with a record of 30-3 (25). Mildenberger lost the fight via 12-round unanimous decision.
On September 10, 1966 Karl Mildenberger fought Muhammad Ali in a heavyweight world-title fight for Ali's WBC title. Mildenberger was 28 years old and with a record of 49-3-3 (17), and Ali was 24 years old and with a record of 25-0 (20). Mildenberger lost the fight via 12th-round TKO.
On February 24, 1962 Karl Mildenberger faced off against Dick Richardson at age 24. He was coming in with a record of 30-2 (13). Mildenberger lost the fight via 1st-round KO.
On November 7, 1959 Karl Mildenberger faced off against Helmut Ball at age 21. He was coming in with a record of 11-1 (4). Mildenberger lost the fight via 7th-round KO.
