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Kirk Johnson had a total of two losses in his professional boxing career — one of them in a title bout and one in a non-title bout. He suffered his first loss against John Ruiz via 10 round disqualification on July 27, 2002, which ended his 32-fight win streak. He has been stopped once and lost once via decision.
Vitali Klitschko and John Ruiz are the two boxers who have beaten Johnson.
This is the first loss in Kirk Johnson's career. Johnson lost to American boxer John Ruiz via 10 round disqualification on . He was fighting for Ruiz' heavyweight WBA title, he was 30 years old with a record of 32-0-1. Ruiz was also 30 years old, with a record of 37-4-1.
On Johnson lost to Ukrainian boxer Vitali Klitschko via 2nd round TKO in a non-title bout. He was 31 years old with a record of 34-1-1. Klitschko was 32 years old with a record of 32-2.