Mayweather, 38, easily out-boxed his younger opponent over the 12 rounds to retain his WBC and WBA welterweight titles and improve his perfect career record to 49-0, matching the benchmark set by former heavyweight champion Rocky Marciano.
Asked if he might be tempted to come back for a 50th fight, Mayweather replied: “My career is over. It’s official.
“You’ve got no one to hang it up, so I think it’s about time for me to hang it up. I’m not going to be doing it now. I’m close to 40 years old, I’ve been in this sport 19 years, been world champion for 18 years, I’ve broken all records.
“There’s nothing left to prove in the sport of boxing.”