Runner-up Novak Djokovic of Serbia poses with his trophy after the men’s final match for the French Open tennis tournament at Roland Garros in Paris, France, 07 June 2015. EPA/IAN LANGSDONEPA

Stan Wawrinka of Switzerland poses with the winner’s trophy after beating Novak Djokovic of Serbia in the men’s final match for the French Open tennis tournament at Roland Garros in Paris, France, 07 June 2015. EPA/ROBERT GHEMENT

Bethanie Mattek-Sands of the USA (R) and Lucie Safarova of the Czech Republic pose with their trophy after winning the women’s doubles final of the French Open tennis tournament at Roland Garros in Paris, France, 07 June 2015. EPA/ROBERT GHEMENT

Winner Stan Wawrinka of Switzerland (R) and runner-up Novak Djokovic of Serbia pose with their trophies after the men’s final match for the French Open tennis tournament at Roland Garros in Paris, France, 07 June 2015. EPA/ROBERT GHEMENT

Bethanie Mattek-Sands of the USA (R) and Lucie Safarova of the Czech Republic (2R) pose with their trophy after winning the women’s doubles final of the French Open tennis tournament at Roland Garros in Paris, France, 07 June 2015. Casey Dellacqua of Australia (L) and Yaroslava Shvedova Kazakhstan hold their runner-up trophies. EPA/ROBERT GHEMENT

Serena Williams of the USA poses with the winner’s trophy after beating Lucie Safarova of Czech Republic in the women’s final match for the French Open tennis tournament at Roland Garros in Paris, France, 06 June 2015. EPA/ROBERT GHEMENT