Floyd Mayweather retained his welterweight crown and improved to 49-0 by winning a 12-round unanimous decision over Andre Berto on Saturday night in Las Vegas.
The 38-year-old Mayweather said afterward that the match was his last. If that holds true, he will tie legendary heavyweight Rocky Marciano for most wins by an unbeaten boxer.
"You got to know when to hang it up, and it's time for me to hang it up," Mayweather said. "I'm not going to be doing this when I'm 40 years old.
"There's nothing else for me to do in the sport of boxing. I made great investments, I'm financially stable. Well off. I had a great career. My record speaks for itself."
The three judges scored it 120-108, 118-110, 117-11. Mayweather landed 57 percent of his punches while Berto (30-4) landed just 17 percent.
Mayweather earned $32 million for the bout while the 32-year-old Berto took home $4 million.
When prodded, Mayweather insisted he will not return to the ring.
"I'm leaving the sport with all my faculties," Mayweather said. "I'm still smart, I'm still sharp. I've accomplished everything. There's nothing else to accomplish. I am the best."