I voted Calzaghe UD. I don't think he'd be able to knock him out as I'm unsure as to whether Joe's hands allow him to put as much power as he'd like behind his shots. Don't get me wrong, I think Kessler is great and looks to be very strong, he also keeps his cool and doesn't seem to get swept up in the moment or pulled down to the other guys level like Joe, I just don't think he is quite as versatile has Joe. Also Joe has a bit of a macho streak which I think would push him to retaliate in flurries everytime he got caught. I think he'd figure out Kesslers style and adapt to it by the middle rounds. Calzaghe has great stamina too.

Calzaghe UD