Floyd Mayweather (left) stayed undefeated by getting the best of Victor Ortiz in the fourth round in Las Vegas.
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Mayweather was winning the fight through three rounds, dominating with speed and landing good right hands to the head of Ortiz. He won all three rounds on two ringside scorecards, and two of three on the third.
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What brief success Victor Ortiz came in the fourth round, when he connected with a string of power punches.
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Victor Ortiz landed 26 of 148 punches (18 percent) on the night -- including zero of 31 jabs.
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Mayweather remained unbeaten in 42 fights, scoring the knockout he had predicted. Ortiz, who lost his 147-pound title, fell to 29-3-2.
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The end came just as the two fighters emerged from a break, in which Ortiz had embraced Mayweather in the center of the ring to apologize for the head butt. As they broke, Mayweather shot out a left hand and followed it with a right that put Ortiz down in his corner.
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Ortiz remained on the canvas for several minutes after getting counted out.
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While Ortiz claimed he was caught by a punch that came before Cortez ruled the fighters to continue, the referee said Mayweather did nothing wrong.
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Mayweather won by a knockout at 2:59 of the fourth round.
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Mayweather made a minimum of $25 million for his first fight in 16 months, a sum that will likely go up as the pay-per-view receipts are totaled. He could make even more against Manny Pacquiao next May should Pacquiao win his November fight with Juan Manuel Marquez and the two finally agree to fight.
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Mayweather celebrated with "best friend" 50 Cent afterward.
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If Mayweather's hometown advantage wasn't obvious enough, his super-sized image was plastered alongside the MGM Grand throughout the build-up to Saturday's fight.
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