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The 32-year-old has no intentions of fighting past 35, and he probably won't if he continues to walk through his opponents.
This could be cut short if he doesn't get the fight with Floyd Mayweather Jr. If he never does get that fight, he can't possibly have anything more to prove.
There have been negotiations of him fighting Juan Manuel Marquez for a third time, but he doesn't seem to interested in that. He had beaten the Mexican boxer in their rematch by split-decision.
Wins over Oscar De La Hoya, Ricky Hatton, Marco Antonio Barrera, Erik Morales and Miguel Cotto highlight his career of dominance and desperation to be the best boxer in the world.
He was 2000's "Fighter of the Decade." How could he top that? He would have to continue fighting for the good first half or more of 2010-2020 and even then, risk losing at an age where his skills will start to decline.
This may not be his last fight but if it is, it wouldn't hurt the legacy he had already built.