Mayweather returns to ring in September against Berto

Floyd Mayweather, Jr. of the U.S. yells out to the crowd after defeating Manny Pacquiao of the Philippines in their welterweight WBO, WBC and WBA (Super) title fight in Las Vegas, Nevada, May 2, 2015. REUTERS/Steve Marcus

(Reuters) - Floyd "Money" Mayweather (48-0) will put his unbeaten record on the line when he steps into the ring to face Andre Berto in Las Vegas on Sept. 12 in what could be the final fight of his career, it was announced on Tuesday.

Mayweather, who beat Manny Pacquiao in May in what was billed as the "Fight of the Century", will risk his WBC and WBA welterweight world titles against the power-punching, two-time welterweight world champion Berto (30-3) at the MGM Grand Garden Arena.