LAS VEGAS -- Sugar Shane Mosley's May 31 fight with Zab Judah has been canceled after Judah seriously injured his arm in an accidental fall.

Judah severely cut his right forearm and needed 50 stitches to close the wounds, and that'll keep him out of training for four weeks.

Golden Boy Promotions said they'll try to reschedule. The fight had been scheduled at the Mandalay Bay Event Center in Las Vegas.

Judah's 36-5, with 25 knockouts. He's a former undisputed welterweight champion trying for a career comeback.

Mosley's 44-5, with 37 KOs. He's a former three-division champion, but lost a competitive unanimous decision last November to Miguel Cotto.