LAS VEGAS – On a night when a star-studded crowd that included Republican presidential nominee Gov. Mitt Romney, Dodgers owner Magic Johnson and hip hop star 50 Cent were seated at ringside at the sold-out MGM Grand Garden, Juan Manuel Marquez delivered the best performance of his career.

He knocked Manny Pacquiao out as the sixth round ended, putting the Filipino superstar out face first on the canvas. Pacquiao had missed a right and Marquez used his specialty, the counter right hand, to close the show.

He landed the right directly on the chin, putting Pacquiao out cold. Pacquiao's wife, Jinkee, shrieked out and attempted to get to the ring. Promoter Bob Arum put his arm around her shoulder to comfort her.