The women are through the first round and the men are ramping up play on Monday as everyone gets a taste of the blue clay in Madrid.
Here are the matches to keep an eye on:
Elena Vesnina vs. Serena Williams - Serena gets her first taste the blue clay.
Jelena Jankovic vs. Carla Suarez Navarro
Chanelle Scheepers vs. Sara Errani
Angelique Kerber vs. Venus Williams - Should be very close. Would be a huge win for Venus.
Samantha Stosur vs. Christina McHale
Viktor Troicki vs. Donald Young - Can Young win more than just a few games?
Sergiy Stakhovsky vs. Ryan Harrison
Igor Andreev vs. Juan Carlos Ferrero