I've had this discussion many times. Luckily for me all my friends and my family are die-hard boxing fans. The majority of them think Mayweather will lose to someone who brings the fight to him and pours the pressure. For example, Hatton, Cotto, or the bigger De La Hoya(I knew he wouldn't pull it off). Fighters like Hatton and Cotto come in like a bull and Mayweather will stick them with shots then move when they get within range.

I personally think a fighter like Shane Mosley or Paul Williams would eventually dethrone PBF. PBF has to be outboxed not overpowered. I think Sugar Shane has the tools to beat him, but not at this point being that he's already weathered. Even if PBF and Mosley fought last year, I still think Mosley would've gotten him. Mosley has the speed, the footwork, the ring generalship, and the power to make PBF look human.