MANILA, Philippines – Floyd Mayweather and Robert Guerrero are set to battle for 12 rounds for the undefeated fighter’s WBC welterweight world championship and the vacant RING Magazine welterweight belt. Mayweather weighed in at 146-pounds, while Guerrero checked in at the weight class limit of 147. The 36-year-old Mayweather will bring a perfect 43-0 record with him when he steps into the ring at the MGM Grand Garden Arena for the first bout of his six-fight deal with Showtime pay-per-view. Mayweather will earn $32-million, while Guerrero’s purse is considerably smaller at $3-million. ANC, May 5, 2013