Venus Williams of the US returns the ball during the first round match of the French Open tennis tournament against Switzerland's Belinda Bencic at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/David Vincent)
France's Alize Lim serves the ball during the first round match of the French Open tennis tournament against Serena Williams of the U.S. at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/Darko Vojinovic)
Tomas Berdych of the Czech Republic celebrates winning the first round match of the French Open tennis tournament against Canada's Peter Polansky at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/Michel Spingler)
Tomas Berdych, left, of the Czech Republic, answers reporters after the 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)
France's Pierre-Hugues Herbert reacts as he plays USA's John Isner 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/David Vincent)
USA's John Isner serves to France's Pierre-Hugues Herbert 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/David Vincent)
USA's John Isner returns the ball to France's Pierre-Hugues Herbert 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/David Vincent)