Mayweather decisions Berto in last fight to remain unbeaten

Floyd Mayweather Jr., left, throws a left at Andre Berto during their welterweight title boxing bout Saturday, September 12, 2015, in Las Vegas. AP

LAS VEGAS, United States — 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.

By the late rounds, Mayweather was both talking to Berto and taunting him, secure in the knowledge he was winning big against the 18-1 underdog. In the final seconds of the fight he took a victory lap, fist raised in air.