Boxers Floyd Mayweather Jr. (L) and Juan Manuel Marquez pose with retired boxer Oscar De La Hoya (C) on top of the Empire State Building in New York May 19, 2009. Already accepted as one of the greatest boxers of any era, American Mayweather decided to come out of retirement for a third time to add further gloss to his glittering career. The undefeated five-division world champion has not fought for 17 months but will take on Mexico's five-time world champion Marquez in a non-title welterweight bout in Las Vegas on July 18. REUTERS/Teddy Blackburn (UNITED STATES SPORT BOXING)