I don't think Mayweather is significantly bigger than Marquez

well let's see. JMM started at featherweight and superfeather until '08. then TWO fights in '09 at lightweight. Never takes a fight at 140 and will skip directly to WW(144 catchweight) FMJ started at SFW and moved up all the way to 154(came in at 150). has been a welter since 05 and except for Baldomir has come in to the WW fights at 145. So, he is not that much bigger BUT he IS bigger and is used to the weight. Mayweather has every single advantage for this fight EVERY advantage............. should be fun thou while it lasts.

well let's see. JMM started at featherweight and superfeather until '08. then TWO fights in '09 at lightweight. Never takes a fight at 140 and will skip directly to WW(144 catchweight) FMJ started at SFW and moved up all the way to 154(came in at 150). has been a welter since 05 and except for Baldomir has come in to the WW fights at 145. So, he is not that much bigger BUT he IS bigger and is used to the weight. Mayweather has every single advantage for this fight

No, I couldnt disagree more....PBF has advantages in height, reach and has a far thicker build - in terms of size difference this will look like a mini Lewis - Tyson.

Mayweather fought bigger guys for years.