Nike Tennis on Facebook has a competition up. Details below..

On Tuesday, Rafael Nadal, Roger Federer, Maria Sharapova, and Victoria Azarenka take center court for the Clash of the Champions.

Post your questions for them here. The ones with the most "likes" will be added to our interview list! Contest ends Sunday at 9pm PST, so start posting and get your family and friends to help push your question to the top!

link: Submit your question here