WBO welterweight champ Antonio Margarito (33-4) retained his title against Joshua Clottey (30-1) via unanimous decision ... but it wasn't easy. Clottey's punches were far more accurate and effective through four rounds as Margarito looked rusty and vulnerable. Clottey, however, apparently broke his left hand in the fourth round and was unable to maintain his advantage. Margarito gradually took control of the fight but never dominated, as Clottey remained competitive until the final bell. All three judges gave the fight to Margarito: 118-109, 116-112 and 116-112. Margarito's next bout may be a mandatory defense against rising star Paul Williams (32-0), who stands over six-feet tall and - if Margarito avoids him - will inherit Margarito's place as the welterweight none of the big names wants to face.