Poland's Jerzy Janowicz returns the ball to Dominican Republic's Victor Estrella Burgos during their first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/Michel Euler)
Dominican Republic's Victor Estrella Burgos backhands to Poland's Jerzy Janowicz during their first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/Michel Euler)
Dominican Republic's Victor Estrella Burgos backhands to Poland's Jerzy Janowicz during their first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/Michel Euler)
Germany's Angelique Kerber reacts as she plays Poland's Katarzyna Piter during the first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/David Vincent)