Lil Wayne performed the lead single from his new "Tha Carter V" album, “Believe Me,” said to be FLOYD MAYWEATHER's favorite song, as Mayweather, alongside his bff Justin Bieber took a confident stride to the ring. Floyd Mayweather (46-0) faced off against and defeated Marcos Maidana (35-4) on Saturday night in a welterweight unification bout from the MGM Grand in Las Vegas. Mayweather racked up another big payday last night as his total career earnings reach $400 million.