I see potential for a fair number of upsets on Day 1. How healthy is defending champion Ivanovic? Errani can play a decent clay game. Lleyton could definitely get under Karlovic's skin - and Karlovic has not been near the top of his game lately. Gaston has been playing well, be interesting to see if he can keep it up against Radek. Roberta Vinci can make some trouble for Vika. And Simon had a disasterous week in Germany, while Wayne-O might not be a master of red dirt, Gilles is clearly slumping, and if someone is ripe for the picking, it might be him.