Most of the top players in the world hit the blue clay on Wednesday.
Here's what to keep an eye on:
Men
Nikolay Davydenko vs. Rafael Nadal - Rafael Nadal makes his debut on the blue clay.
Roger Federer vs. Milos Raonic
John Isner vs. Marin Cilic - A lot is now expected of Isner on clay.
Ryan Harrison vs. Jo-Wilfried Tsonga - Harrison is due for a big win.
Women
Agnieszka Radwanska vs. Sara Errani - Errani has won 3 clay court events in 2012. She's legit.
Victoria Azarenka vs. Ana Ivanovic
Angelique Kerber vs. Na Li
Sam Stosur vs. Petra Cetkovska