Venus Williams

 Somebody can easily look at it from the angle that Venus has not been tested yet, while Serena has. Lots of times in tennis a certain player breeze's thru there side of the draw while going basically untested, then when they finally meet someone legit (im not going to count Safina because shes a headcase) they have trouble. Demientieva played out of her mind today, she couldnt have played any better and her game is a terrible matchup for Serena because shes possibly the only other player outside of her sister that can match groudnstrokes with her. I like the fact that Serena has beaten Dementieva and Azarenka too players who have been in good form and tough on grass while Venus tooled Radwanska and a mentally fragile Safina.

I think Serena wins