They're two of my favorite fighters around right now. I think I agree with you. Not that Diaz is a huge puncher or Malignaggi has a weak chin, but pressure busts pipes.
No worries. I just don't think he'll be stopped. Hatton and Cotto - both ****ers at 140 - couldn't manage it, so I don't think a natural 135'er in Diaz will pull it off either.
(And no, I don't count a non-voluntary corner stoppage. Buddy McQuit was an idiot for pulling him out.)
Comment