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Francisco Lorenzo (33-4, 14 KOs), who had been down and was being battered, was ruled a disqualification winner against Humberto Soto at 2:43 of the fourth round after Soto was ruled by referee Joe Cortez to have hit him while he was down.

They were fighting for an interim junior lightweight title, which was made available by the WBC because champion Pacquiao was moving up to challenge for a lightweight title in the main event. However, because of the controversial ending, the WBC elected not to award the interim title, which remains vacant.

It was Soto's second crack at a 130-pound title and another disappointment. He lost a decision to Joan Guzman in November after being outboxed over the second half of the fight. But Soto, 28, had no such problems against Lorenzo.

Soto (43-7-2, 27 KOs), 27, took control from the outset and was rocking Lorenzo, 36, of the Dominican Republic, with a steady stream of hard blows.

But then confusion reigned in the fourth round. Lorenzo was bleeding from his nose, had gone down from a left uppercut and was being dominated.

After the knockdown, Lorenzo was trying to grab Soto but Soto connected in the corner.

Lorenzo, who had been outlanded 19-4 in the round, took a knee. But referee Joe Cortez didn't count, instead indicating that Soto had hit him while he was down.

"He got disqualified because he got hit while he was down," Cortez. "That's a disqualification. I watched the replay to make sure that is what I saw."

Replays indicated that Soto had indeed thrown a punch but that, at best, it grazed Lorenzo's head.

"I don't understand. I didn't hit him when he was down. It was all glancing," Soto said. "I'm really surprised. I never imagined it would come to this. Luck has not been with me."

While Soto was sent to a neutral corner, Lorenzo lay bleeding on the canvas with the doctor looking at him. Cortez conferred with Nevada commission executive director Keith Kizer and other commission officials. After several minutes, Cortez called off the fight and Lorenzo was given the victory.

"It was a good stoppage because I was hit in back of the head while I was down," Lorenzo said.

When he raised his hands, the crowd booed loudly.

Soto had been mentioned as a possible opponent for Pacquiao in the fall. Now, perhaps, there will be a rematch with Lorenzo.

"I don't know if he wants a rematch because in the rematch I would knock his head off," Soto said.



Dan Rafael is ESPN.com's boxing writer.