World Boxing Council super flyweight champion Gilbert Roman got off the canvas after a surprise fourth-round knockdown Saturday night to stop Japanese challenger Yoshiyuki Uchida in the fifth round of their scheduled 12-round title fight and retain his crown.

Referee Richard Steele of Nevada stopped the fight with 39 seconds gone in the fifth after Uchida had been decked twice with vicious left hooks to his face.The 26-year-old champion knocked down Uchida only seconds into the round with the first blow but the challenger regained his feet after taking the mandatory eight count.

Seconds later, the Mexican decked Uchida again with a left to the chin. Uchida, suffering a cut over his left eye, stumbled to his feet but the referee quickly moved in to stop the bout.

At Atlantic City, N.J., Orlando Canizales unleashed a vicious 15-round flurry to stop Kelvin Seabrooks and become the new International Boxing Federation bantamweight champion.

Canizales, who floored Seabrooks with an overhand right in the first round, decked him with another counter-right in the 15th. After the defending champion rose on the count of four, Canizles landed 15 unanswered punches before referee Rudy Battle stopped the fight at 1:03 of the round.

Canizales pressed on despite a cut over his left eye and bruised hands that he thought were broken.

"I wanted this fight in the worst way," he said. "It didn't matter how many rounds it went, I was going to be there."

He said his opponent was "durable; he wanted to fight back all the time. He made this a tough fight for me."