Sergio Martinez and Paul Williams landed punch after punch a year ago in an instant classic, one of those rare occasions when two of the best boxers in the world come together to create something special.
Their rematch Saturday night didn't last nearly as long, and only one punch mattered.
Martinez landed a devastating left hook early in the second round, knocking out one of boxing's most feared punchers while retaining his middleweight championship.
The sudden outcome left a lively crowd at Boardwalk Hall in stunned silence.
"I started to attack, and when I did, we knew he was going to make a mistake, because he always makes mistakes," Martinez said. "He left me a lot of room to come in and hit him."
Williams was looking to land his own hook and instead walked right into the punch, which landed flush on the chin and sent the challenger face-down onto the canvas. Martinez immediately ran across the ring to celebrate while doctors rushed in to tend to Williams.
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