Floyd Mayweather puts his 45-0 record on the line when he takes on Marcos Maidana in May and snubbing Amir Khan. The undisputed welterweight world champion Floyd Mayweather celebrated his 37th birthday by declaring to the public he will put his 45-0 record on the line on May 3 against Marcos Maidana. Monday's move comes after weeks of speculation as to whether Mayweather would fill his May fight date with Argentina's Maidana or England's Amir Khan.

The self-confident American even ran an internet poll in which fans voted for the Khan match-up, but World Boxing Council welterweight champion Mayweather instead will take on World Boxing Association champ Maidana in a unification bout.

"Maidana's last performance immediately brought him to my attention," Mayweather said of Maidana's comprehensive defeat of the previously unbeaten Adrien Broner on December 14. The 30-year-old Maidana intimated Broner from the opening bell and registered two knockdowns against the three-time world champion.

"He is an extremely skilled fighter who brings knockout danger to the ring. I think this is a great fight for me and he deserves the opportunity to see if he can do what 45 others have tried to do before him - beat me."  At 45-0 with 26 knockouts, Mayweather is approaching the 46-0 career mark of retired Welsh star Joe Calzaghe and the iconic 49-0 mark of heavyweight legend Rocky Marciano.

Khan fans are sure to be riled. Mayweather set in motion a flurry of online polls following a message posted to his Twitter and Instagram accounts earlier this month asking fans to voice their opinion on his next opponent. At least one of the online polls showed Khan had swept past Maidana to get the nod from fans 20,105 votes to 15,474.

Khan, 28-3 with 19 knockouts, pulled out of a planned December world title fight for the chance to take the ring with Mayweather and has not fought since last April.