Floyd Mayweather made it 49 straight wins with a wide points victory over Andre Berto in Las Vegas last night.
The challenger was game, but his fellow American, defending his WBC and WBA welterweight titles, was simply too difficult to hit at the MGM Grand.
Mayweather, 38, was awarded the verdict 120-108, 118-110 and 117-111.
Mayweather was adamant it was his last fight, but having equalled Rocky Marciano’s career record of 49-0, he might decide to have one more.
“My career is over, that’s official,” said five-weight world champion Mayweather, widely regarded as the greatest fighter of his generation.
“You’ve got to know when to hang them up. I’m close to 40 now. There’s nothing left to prove in the sport of boxing. Now I just want to spend time with my family.
“I am leaving the sport with all my faculties, I’m still sharp and smart. I’ve accomplished everything in this sport, there’s nothing else to accomplish.”