Maria Sharapova of Russia serves during the women's singles second round match against her compatriot Vitalia Diatchenko at 2015 French Open tennis tournament at Roland Garros, in Paris, France on May 27, 2015. Sharapova won 2-0. (Xinhua/Chen Xiaowei)

Maria Sharapova of Russia competes during the women's singles second round match against her compatriot Vitalia Diatchenko at 2015 French Open tennis tournament at Roland Garros, in Paris, France on May 27, 2015. Sharapova won 2-0. (Xinhua/Chen Xiaowei)

Maria Sharapova of Russia serves during the women's singles second round match against her compatriot Vitalia Diatchenko at 2015 French Open tennis tournament at Roland Garros, in Paris, France on May 27, 2015. Sharapova won 2-0. (Xinhua/Chen Xiaowei)

Maria Sharapova of Russia competes during the women's singles second round match against her compatriot Vitalia Diatchenko at 2015 French Open tennis tournament at Roland Garros, in Paris, France on May 27, 2015. Sharapova won 2-0. (Xinhua/Chen Xiaowei)

Vitalia Diatchenko of Russia competes during the women's singles second round match against her compatriot Maria Sharapova at 2015 French Open tennis tournament at Roland Garros, in Paris, France on May 27, 2015. Sharapova won 2-0. (Xinhua/Chen Xiaowei)

Vitalia Diatchenko of Russia serves during the women's singles second round match against her compatriot Maria Sharapova at 2015 French Open tennis tournament at Roland Garros, in Paris, France on May 27, 2015. Sharapova won 2-0. (Xinhua/Chen Xiaowei)

Maria Sharapova of Russia competes during the women's singles second round match against her compatriot Vitalia Diatchenko at 2015 French Open tennis tournament at Roland Garros, in Paris, France on May 27, 2015. Sharapova won 2-0. (Xinhua/Chen Xiaowei)

Maria Sharapova of Russia blows a kiss to the crowd after winning the women's singles second round match against her compatriot Vitalia Diatchenko at 2015 French Open tennis tournament at Roland Garros, in Paris, France on May 27, 2015. Sharapova won 2-0. (Xinhua/Chen Xiaowei)

Maria Sharapova of Russia blows a kiss to the crowd after winning the women's singles second round match against her compatriot Vitalia Diatchenko at 2015 French Open tennis tournament at Roland Garros, in Paris, France on May 27, 2015. Sharapova won 2-0. (Xinhua/Chen Xiaowei)