Andy's serving has apparently been a bit sloppy so far but then again he's often proved to be a bit of a slow-starter. Davydenko's serve shouldn't cause Andy any major problems so he'll always be in with a chance on Davydenko's service games. The major factor will be whether he's able to hit through the Russian
Looking at the stats, Davydenko's winning nearly all the points on his 2nd serve which suggests that Andy isn't attacking it enough - that's something he'll need to do as it's one of Davydenko's big weaknesses