Top top class fighters should be able to go 15 hard fought rounds if they want to cut it with the elite.

Reason why i and my mates all had so much money on toni stopping him was a his dodgy chin, but mainly coz the he tires badly...

Look at pretty much every 12 round fight wtih except the urkal one and you see cotto slipping in the later rounds and letting the other guy in, toni never stops and was in the end going to break him.