San Leandro's Nonito Donaire scored a unanimous decision over WBA featherweight champion Simpiwe Vetyeka on Saturday night after the fight was stopped at the end of the fourth round due to an accidental headbutt.
Donaire, 31, earned a world title in his fourth weight class by capturing the 126-pound bout. He suffered a serious cut over his left eye caused by the first-round headbutt. By the end of the fourth round, Donaire (33-2) could no longer see because of blood running from the cut.
By rule, the bout went to the scorecards, and Donaire won 49-46 on all three cards to secure the victory at the Venetian Resort in Macau.
"After the first round there was a headbutt," Donaire said. "The ref asked me if I want him to stop the fight. I told him I want to continue."
Vetyeka (26-3) headbutted Donaire several more times after the first round, but Donaire remained the aggressor and used a fourth-round combination to leave the South African wobbly.
Donaire said he didn't want the fight to end but could no longer see.
"He (Vetyeka) is a great fighter; he deserves a rematch," Donaire said.
Said promoter Bob Arum, "(Donaire) said he didn't like to win the title that way so he's going to give the South African kid a rematch."
Vetyeka disputed that he had headbutted Donaire.
"I'm terribly upset," Vetyeks said.
Donaire had previously won world titles at flyweight, bantamweight and super bantamweight. He also held an interim title at super flyweight.
Also on the "Featherweight Fury" card, Evgeny Gradovich (19-0) retained his IBF title with a 12-round unanimous decision over Alexander Miskirtchian (24-3-1), and Nicolas Walters (24-0) stopped Vic Darchinyan (39-7-1) in the fifth round.
MCT Information Services contributed to this report.