mainly because of size and weight thats why, technically Haye is only really a Cruiserweight, but he makes up for it with speed, if he gets in close to Klitschko, then he will kill him, but Klitschko has very long arms and is able to stand back and still hit some meighty left jabs/hooks, Haye needs to bide his time, wait for an opening then just go in for the kill and he should be able to get at Klitschko, even if its only on points, problem is that UK boxers don't have a great record in Germany so he really needs to knock Klitschko out, and thats not going to be easy