RAMA, Ont. — Panama's Celestino Caballero beat previously undefeated Steve Molitor tonight, stopping the Canadian 52 seconds into the fourth round to retain the WBC super featherweight title and take Molitor's IBF crown.

Caballero improved to 31-2, while Molitor dropped to 28-1.

An uppercut sent Molitor crashing to the canvas early in the fourth, and the referee stepped in to stop it as Caballero readied to pummel The Canadian Kid yet again.

"I worked hard for this fight," Caballero said. "God helped me to this victory. ... Molitor is not a warrior. He was a fine, great champion, but only for the public."

Molitor entered the fight with a 6-0 record in championship bouts.

"He was the better man," Molitor said. "I felt tight going in."