Floyd Mayweather will fight Andre Berto in a welterweight world title clash at the MGM Grand in Las Vegas as he looks to go 49-0 and equal Rocky Marciano's longest undefeated career record.

Mayweather will put his WBA and WBC welterweight titles on the line against former WBC and IBF welterweight champion Berto, who himself has a career record of 33-3.

Speaking after the announcement Mayweather said: "I’m ready to get back in the ring on 12 September and prove again to the whole world why I’m the best ever.

"I always bring my A-game and this fight against Andre Berto is no exception. He’s a young, strong fighter who is hungry to take down the best. Forty-eight have tried before and on 12 September, I’m going to make it 49."

Berto also pipped up with some trash talk of his own following the announcement, stating: "I'm coming to kick Floyd’s ass on 12 September. Best believe that I plan to bring it to Floyd and I'm not concerned about what 48 other fighters have been unable to do. Somebody is getting knocked out and it won't be me. You don't want to miss this."

Berto has already been conquered by Victor Ortiz in 2011 and Robert Guerrero in 2012, both of whom went on to defeats to Mayweather, and the Haitian-American will be a heavy underdog to Money when they clash in Vegas this autumn.

Former WBA and IBF light welterweight world champion, Briton Amir Khan, had campaigned for a fight against Mayweather, but on this occasion has failed to secure the deal and is once more left hoping to be the next fighter in Mayweather's cross hairs, should Money prevail and seek to fight for a 50-0 record in 2016.

Thirty-eight-year-old Mayweather was last in the ring on 2 May when he overcame Manny Pacquiao in the most lucrative fight the sport has ever seen and, while talk of a rematch instantly emerged, the Filipino has since undergone shoulder surgery that could rule him out for up to a year.

Berto, who will be 32 when the pair meet, was undefeated in his first 27 fights but has suffered three losses in his last six to take his record to 33-3.