The fight was stopped in the fourth after a controversial knockout of Ortiz.
Mayweather was in total control of the fight at the time of the stoppage... The controversy began when Ortiz enjoyed a rare flurry of success, backing Mayweather up against the ropes in the fourth round. However, he then struck Mayweather with a headbutt for which he was punished by referee Joe Cortez.
Ortiz attempted to apologize to Mayweather and hugged him near the center of the ring. However, Cortez had already called for time to be restarted. Mayweather let fly with a left hook that stunned Ortiz, then knocked him to the canvas with a straight hand...
...Merchant, the HBO Pay-Per-View commentator, challenged [Mayweather] over the fairness of his winning blows. Mayweather unloaded with both fists a split-second after the fighters had hugged following a headbutt for which his opponent was deducted a point, and Ortiz was unprotected and unaware when the strikes landed.
Merchant suggested that his tactics may have been either illegal or outside the spirit of the fight game, and then Mayweather vented his ire, referring to the 80-year-old broadcaster by an expletive and barking that he should be fired from his television position.
“You never give me a fair shake, all right, so I am going to do you a favor and let you talk to Victor Ortiz,” Mayweather said. “You never give me a fair shake. You are [expletive] and HBO should fire you. You don’t know [expletive] about boxing. You ain’t [expletive].”
...“I wish I was 50 years younger,” [replied] Merchant. “I would have kicked your [expletive].”
These kinds of antics and Mayweather's refusal to fight Manny Pacquiao -- the acknowledged pound-for-pound best boxer in the world -- have worn much of the luster from the champion's once-pristine image.
And if he continues to avoid Pacquiao, it's likely the history books will place a definitive asterisk on his undefeated record.