To answer VD's question, PBF would be Pac's most difficult fight if it happens. With Mayweather's defense, Pac has to use his speed to hurt Mayweather. Pac can hurt Mayweather and aside from his speed and being a southpaw, his punching power is better than Marquez. Remember, Pac dropped Marquez many times in just one round and Mayweather did it only once on Marquez.

Overall, Mayweather though has the advantage over Pac but it will be truly exciting if he fights Pac.