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"I have decided to permanently retire from boxing", Mayweather said in a statement released in Las Vegas. "This decision is not an easy one for me to make as boxing is all I have done since I was a child.

"However, these past few years have been extremely difficult for me to find the desire and joy to continue in the sport."

Mayweather, 31, reached the peak of his career a year ago with a split-decision victory over Oscar De La Hoya. His only fight since then came against Ricky Hatton in December, a bout Mayweather won with a 10th-round TKO.

Mayweather won championships in five different weight divisions and captured a bronze medal at the Atlantic Olympics.

"There comes a time when money doesn't matter", Mayweather said. "I just can't do it anymore."

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