Hopkins got outworked. Looks like after he got the round one KO he never bothered fighting. He threw few big punches hoping to connect and drop Calzaghe. It didn't work. Calzaghe stayed more aggresive and threw much more punches that had less power, basically slapping type punches and won on points.
There is one fight early in his career when a guy, I forget his name, did decisively beat him. Other then that, he got robbed twice, Vargas and Taylor. Him and Hopkins was a mess and too close to call. He's a crafty fighter who can beat anyone in his class. Fighters are no willing to take that chance. BTW he is my favorite fighter.