He was hurt few times. As amateur Haye was KO'd in 1 round by Jim Twite. Super middleweight Lolenga Mock knocked him down hard and had him hurt(Haye recognized that). Then it was Carl Thompson (Haye was hurt badly by punch, not because he was tired) and JM Mormeck, who knocked him down in 4th rd. That's it. All of these fights were at cruiserweight. I can't say his chin is that bad, compared to Amir Khan.
