LAS VEGAS -- No need for Juan Manuel Marquez to impress the judges. No need for the referee to count to 10.
Marquez took care of all of his business Saturday night with a thunderous right hand that left Manny Pacquiao face first on the canvas with his remarkable career in question.
Unable to win a decision in their first three fights, Marquez won the old-fashioned way with a huge right hand that put Pacquiao down for the second time in the fight at 2:59 of the sixth round.
Referee Kenny Bayless never bothered to count as Marquez leaped into his handlers' arms in celebration and Pacquiao's wife broke into tears at ringside.
"I threw a perfect punch," Marquez said. "I knew Manny could knock me out at any time."
It was a stunning end to a thrilling fight, the fourth one in the last eight years between the two men. It could also be the end of the Filipino's career, though he said in the ring afterward he would like to fight Marquez for a fifth time.
"If you give us a chance, we'll fight again," Pacquiao said. "I was just starting to feel confident and then I got careless."
Pacquiao had been down in the third round but knocked Marquez down in the fifth and the two were exchanging heavy blows in the sixth round before Marquez threw a right hand that flattened Pacquiao face down on the canvas.
"I thought I was getting him in the last couple of rounds but I got hit by a strong punch," Pacquiao said. "I never expected that punch."