LAS VEGAS -- Floyd Mayweather Jr. wasn't about to change what he does best in his last fight.  Both dominant and defensive, Mayweather used all the tricks learned in a 19-year pro career Saturday night to take a lopsided 12-round decision over Andre Berto and retain his welterweight titles in what he insists was his final fight.

Mayweather ran his perfect record to 49-0, tying a mark set by the late heavyweight champion Rocky Marciano, in a fight where he was chased but never really tested. He piled up points with a sharp jab and quick counter punches, leaving Berto swinging at air most of the night.

"Andre Berto has heart, a tremendous chin. He wouldn't lay down, it was a good fight," Mayweather said.

"Berto was a tough competitor, but experience played a major role tonight. He's a competitor and what can I say, I was the better man tonight."