Bethanie Mattek-Sands of the U.S. pats 2011 Roland Garros winner Li Na of China on her shoulder after defeating Li Na in their second round match at the French Open tennis tournament, at Roland Garros stadium in Paris, Thursday, May 30, 2013. Mattek-Sands won in three sets 6-1, 5-7, 6-4. (AP Photo/Michel Spingler)

Photo by: Michel Spingler

Bethanie Mattek-Sands of the U.S. pats 2011 Roland Garros winner Li Na of China on her shoulder after defeating Li Na in their second round match at the French Open tennis tournament, at Roland Garros stadium in Paris, Thursday, May 30, 2013. Mattek-Sands won in three sets 6-1, 5-7, 6-4. (AP Photo/Michel Spingler)