Calzaghe started with a blisteringly fast pace, and Lacy's cornermen were thinkin' that Calzaghe couldn't keep up that pace and would slow down after 3 or 4 rds, but Calzaghe had superb conditioning that extremely few possess, and Calzaghe could maintain that blistering pace for a full 12 rds without slowing down nor getting tired. Very, very few have Calzaghe's level of stamina and conditioning, Pacquiao and Stevie Johnston did.

Another thing, Calzaghe had been Champ for almost 9 years when he totally outclassed Lacy.
In Calzaghe's earlier days, he was no Cal-Slappy; he was a KO puncher.
Dude's hands went bad, but he showed his calibre by totally changing his style into a high-paced, low-impact, volume puncher: man found another way to get the job done.