I honestly think Calzaghe would have either run into a huge puncher because his chin isn't super amazing, its really good, but Kessler hurt him several times.

OR

Chad Dawson would have beat him. Chad has that same will to win, is faster, bigger, and goes to the body unlike anybody else who fought Calzaghe. I think he is the first guy who could match Calzaghe in every department, I think even though it was extremely close he stayed in there with a very tough, very high output Glen Johnson who walks through anything.

Which brings me to another guy I've always felt would beat Calazaghe, and thats Glen Johnson, I think he has a way better chin, he would back Calzaghe up and break his will because nobody else has ever matched Joe's stamina and Glen would, I see JOe winning this more often than not, but I think Glen could find a way if he was having a hot night.