how? he beat a guy he's already beaten 3 times before, Mayweather's last 2 opponents haven't gone on to fight again, and Mayweather has never ruined a fighter unless you want to well count Hatton, which would well be reaching a bit, IMO Mayweather shouldn't rematch either, but it makes zero sense that Mayweather should rematch a guy who he pitched a shut out against after nearly a 2 yr layoff whom he could have KO'd at any point and not rematch the guy who's given him his toughest fight, Mayweather should either fight the Pacquiao/Rios winner, Broner/Maidana winner, or even someone like Lara or Trout
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