Floyd Mayweather Jr. is no stranger when it comes to controversy outside the boxing ring. But he generated plenty of it inside the MGM Grand Garden Arena on Saturday night.
Mayweather knocked out Victor Ortiz late in the fourth round of their WBC welterweight title fight when Ortiz appeared to not be ready to continue the fight after he was assessed a one-point deduction from referee Joe Cortez for deliberately head-butting Mayweather.
As Cortez restarted the bout, Mayweather pounced on Ortiz, who was not looking at him, and hit him with a huge left hook to the head followed by a big right hand that sent a stunned Ortiz to the canvas.
Slideshow: Mayweather Knocks out Ortiz for title