Although Del Potro was outclassed by Davydenko today I still get a great feeling about him. His progression has been outstanding. It was only last year that his four tournaments wins in a row were derided by many, this year he won the US Open and in the lull following it he was again written off by some until his great showing at the WTF.
I think as soon as next year Del Potro could become part of the main rivalry, something to replace the Federer Nadal one, which can't last forever. I think at first Federer may cling on and it will be Del Potro and Federer battling out many classic matches. However Federer can't do it forever and then maybe it will be Del Potro and Djokovic or Murray that will be the main rivalry in tennis.
I'd be interested to see some Djokovic-Del Potro matchups. Novak is the only top player yet to be beaten by the Argentine but he's improved so much that I'd have to give the edge to Del Potro now. Who knows though?
I feel 2010 could be the least predictable year yet. Unsure of where Federer will be, still waiting to see if Nadal can come back, Del Potro emerging, Djokovic finding form again, Murray still consistant but looking to win the big prizes amongst a fast developing field, Davydenko reminding us he can beat anyone, Soderling and Verdasco making big statements, Roddick possibly having another great final in him? Add to that the prospect of another player breaking through (Cilic perhaps?)
2010 could be the strongest and toughest year in a long long time. Can't wait til it starts! The only downside is that there are too many players I want to see win a major and not enough of them to go around. My preference would be Federer, Djokovic, Roddick and Del Potro... but Davydenko actually winning one would be incredible for him, and it would be weird for Rafa not to pick up one (still think he's the favourite for the French Open but we'll have to wait for the clay season to see)