Question: When was the British former professional boxer born who competed from 1997 to 2012 and who was defeated in December 2007 against Floyd Mayweather?
Sentence (from "Floyd Mayweather Jr. vs. Juan Manuel Márquez"): Floyd Mayweather vs. Juan Manuel Márquez, billed as Number One/Número Uno, was a welterweight superfight which took place on September 19, 2009, at the MGM Grand Arena in Las Vegas between five-division world champion Floyd Mayweather Jr. (39–0, 25 KO) and three-division champion Juan Manuel Márquez (50–4–1, 37 KO).
Relevant evidence: Yes