manny pacquiao by far because look at what Floyd did to hatton then look at what pacquiao did to hatton, pacquiao is very explosive when he wants to be, and he never stops throwing those punches.
also people will say look at his record, but he only started to develop and peak at a later stage, and hes proved himself at most weight classes
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Vasiyl Lomechenko, who fights at 126 lbs. and despite only 11 professional fights, was voted the #1 fighter by ESPN Pound4Pound. Gennady Golovkin is an undefeated middleweight who destroys opponents, and was #2 on ESPN's list but #1 for 2016. Josh Kelly looks promising but time will tell. Mikey Garcia is one of the best and will likely be Lomachenko's next opponent.
Floyd Mayweather or Manny Pacquiao are determined by the boxing fraternity to be in present day competition for No 1 status LB4LB category (entry 01-24-10).