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John Ruiz had a total of nine losses in his professional boxing career — five of them in title bouts and four in non-title bouts. He suffered his first loss against Sergei Kobozev via 10 round split decision on August 12, 1993, which ended his 14-fight win streak. He has been stopped two times and lost seven times via decision.
David Haye, Ruslan Chagaev, Nikolai Valuev, Roy Jones Jr., and Evander Holyfield are some of the boxers who have beaten Ruiz.
This is the first loss in John Ruiz' career. Ruiz lost to Sergei Kobozev via 10 round split decision on in a non-title bout. He was 21 years old with a record of 14-0.
On Ruiz lost to Danell Nicholson via 12 round split decision in a non-title bout. He was 22 years old with a record of 18-1.
On Ruiz lost to Samoan boxer David Tua via 1st round KO in a non-title bout. He was 24 years old with a record of 25-2. Tua was 23 years old with a record of 22-0.
On Ruiz lost to Evander Holyfield via 12 round unanimous decision. He and Holyfield were fighting for the vacant heavyweight WBA title. He was 28 years old with a record of 36-3. Holyfield was 37 years old with a record of 36-4-1.
On Ruiz lost to Roy Jones Jr. via 12 round unanimous decision. He was defending his heavyweight WBA title, he was 31 years old with a record of 38-4-1. Jones Jr. was 34 years old with a record of 47-1.
On Ruiz lost to Russian boxer Nikolai Valuev via 12 round majority decision. He was defending his heavyweight WBA title, he was 33 years old with a record of 41-5-1. Valuev was 32 years old with a record of 42-0.
On Ruiz lost to Uzbekistani boxer Ruslan Chagaev via 12 round split decision in a non-title bout. He was 34 years old with a record of 41-6-1. Chagaev was 28 years old with a record of 21-0-1.
On Ruiz lost to Russian boxer Nikolai Valuev in a rematch via 12 round unanimous decision. He and Valuev were fighting for the vacant heavyweight WBA title. He was 36 years old with a record of 43-7-1. Valuev was 35 years old with a record of 48-1.
On Ruiz lost to British boxer David Haye via 9th round TKO. He was fighting for Haye's heavyweight WBA title, he was 38 years old with a record of 44-8-1. Haye was 29 years old with a record of 23-1.