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Paul Williams had a total of two losses in his professional boxing career — both of them in title bouts. He suffered his first loss against Carlos Quintana via 12 round unanimous decision on February 9, 2008, which ended his 33-fight win streak. He has been stopped once and lost once via decision.
Sergio Martínez and Carlos Quintana are the two boxers who have beaten Williams.
This is the first loss in Paul Williams' career. Williams lost to Puerto Rican boxer Carlos Quintana via 12 round unanimous decision on . He was defending his welterweight WBO title, he was 26 years old with a record of 33-0. Quintana was 31 years old with a record of 24-1.
On Williams lost to Argentinian boxer Sergio Martínez in a rematch via 2nd round KO. He was fighting for Martínez' middleweight WBC and The Ring titles, he was 29 years old with a record of 39-1. Martínez was 35 years old with a record of 45-2-2.