I think Delpo is a very clean ball striker too,and solely based on what I've seen from him in these few months,his groundstrokes do more damage and less unforced errors than Davy's high risk high reward style of play. Both have excellent groundstrokes though,I'd just rate Delpo's a little higher due to such power he has demonstrated.
check out London finals for the answer
Del Potro for sure. Davydenko has great technique, but Del Potro's physical gifts allow him to hit the ball with more power and much better consistency. Not sure what happened at the WTF....Del Potro seemed very out of sorts there.
Davydenko is a more clean striker as you say, I'd say his groundstrokes are overall better, but Del Potro has something that Davydenko doesnt, probably a more solid gameplan.
davydenko can take the ball earlier than delpo
Who the heck voted for Davy? DelPo does amazing things with the ball and just crushes it. DelPo has far superior ground strokes and that is one of the reasons he can beat Roger and Davy can't.