They (arguably) both put on their most dominating performances at that weight. Who would win if the fight happened at 140, instead of 147?
EDIT: I don't mean if Mayweather and Pacquiao cut down to 140, right now. I mean if the 140 lb, 2005 version of Mayweather fought the 140 lb, 2009 version of Pacquiao.
EDIT: I don't mean if Mayweather and Pacquiao cut down to 140, right now. I mean if the 140 lb, 2005 version of Mayweather fought the 140 lb, 2009 version of Pacquiao.

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