Floyd Mayweather Jr. is gearing up for the biggest fight of his career on May 2, but he said he isn't having much fun doing it. At his media workout on Tuesday, Mayweather said boxing doesn't excite him like it once did, and revealed when he will leave the sport for good.

"No. I don't enjoy it like I once did," Mayweather said. "It is at a point where it is business. It is my job. I go to the gym. I train. I know what I have to do."

Mayweather is on the fifth fight of a six-fight, revenue-sharing deal with Showtime. When asked about retiring Mayweather, 38, gave a definitive timeline for the end of his career.

"My last fight is in September."

His fight with Manny Pacquiao is among the most anticipated fights in boxing history; Mayweather is the premier defensive fighter of his generation while Pacquiao is the premier offensive fighter. Mayweather thinks his braniac approach will thwart Pacquiao's speedy aggression.

"Reckless fighter," was how Mayweather characterized Pacquiao. "He fought very, very recklessly in the Marquez fight," Mayweather said, referencing a 2013 knockout loss to Juan Manuel Marquez. It was the fourth meeting between the two, and Pacquiao had scored a knockdown of Marquez prior to being finished with a short right counter shot.

"I could have had the same type of career but my career wouldn't have lasted this long."

"Money" Mayweather also addressed rumors that he was struggling with southpaw Zab Judah in his camp, and had to halt sparring with a busted lip.

"I can have a good day in the gym and the sparring partners can have a good day on me. That don't count. It counts under the lights when it is for all the marbles," he said.

[Yahoo]