Floyd Mayweather brought the curtain down on his remarkable fight career after preserving his unbeaten record with a convincing victory over Andre Berto in Las Vegas. The 38-year-old dominated his opponent from the first to last bell and was awarded a unanimous points decision by the judges - 120-108, 118-110 and 117-111. Aside from successfully defending his WBC and WBA welterweight titles, Mayweather also equalled Rocky Marciano's career record of 49-0, in what he claims was his last ever fight."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."