Floyd Mayweather beat Robert Guerrero on points in Las Vegas to retain his WBC welterweight title and improve his career record to 44-0.
Mayweather, returning after a year's absence, won a unanimous decision 117-111 after taking control of the fight early and punishing Guerrero in the later rounds.
Guerrero at least started strong as he landed a series of blows with his left, pushing the 36-year-old Mayweather back on to the ropes in the second round.
But by the third round Mayweather had taken control as he started to land some more damaging blows.
The reigning champion was setting the tempo while Guerrero battled hard with little reward.
By the eighth inning, Guerrero was showing clear damage about the eye and it soon opened into a cut.
That prompted another burst of energy from the 30-year-old as he tried to find a way back into the fight, but Mayweather had an answer for everything.
It was Guerrero's second defeat as a professional, dropping his record to 31-2.