Russian tennis player Maria Sharapova (2nd L) and Spanish tennis player Rafael Nadal (1st R) attend the draw for the 2015 French Open tennis tournament in Paris, France, on May 22, 2015. (Xinhua/Chen Xiaowei)

Spanish tennis player Rafael Nadal attends the draw for the 2015 French Open tennis tournament in Paris, France, on May 22, 2015. (Xinhua/Chen Xiaowei)

Spanish tennis player Rafael Nadal attends the draw for the 2015 French Open tennis tournament in Paris, France, on May 22, 2015. (Xinhua/Chen Xiaowei)

Russian tennis player Maria Sharapova attends the draw for the 2015 French Open tennis tournament in Paris, France, on May 22, 2015. (Xinhua/Chen Xiaowei)

Russian tennis player Maria Sharapova attends the draw for the 2015 French Open tennis tournament in Paris, France, on May 22, 2015. (Xinhua/Chen Xiaowei)