Floyd Mayweather Jr.'s hand OK

LAS VEGAS -- Welterweight champion Floyd Mayweather Jr. landed so many clean right hands against Robert Guerrero in a one-sided decision win on Saturday night at the MGM Grand Garden Arena that it was no wonder the pound-for-pound king's hand was sore.

Mayweather said after the fight that he hurt his hand late in the bout -- the reason, he said, he was not able to finish Guerrero off and get a knockout.

Mayweather's hand looked swollen and discolored when he showed it to media members after the postfight news conference. The health of Mayweather's hand is critical if he is to return to fight an opponent to be determined on Sept. 14 at the MGM Grand in the second pay-per-view fight of his 30-month, six-fight deal with Showtime/CBS, which Mayweather said will bring him to the end of his fighting career.

Mayweather (44-0, 26 KOs) said at the postfight news conference that he planned to still fight on Sept. 14, and his visit to the doctor after that seemed to match his optimism about keeping the date.

"He went to hospital [Saturday] night, and everything is fine," Kelly Swanson, Mayweather's longtime publicist, told ESPN.com on Sunday. "He just experienced some soreness."

Guerrero (31-2-1, 18 KOs), who suffered a cut over his left eye during the fight -- which Mayweather won 117-111 on all three scorecards to retain the title -- also saw a doctor after the fight.

Luis DeCubas Jr., Guerrero's co-manager, told ESPN.com that Guerrero needed three stitches to close the wound.