FILE – In this May 17, 2013 file photo, Serbia’s Novak Djokovic returns the ball to Czech Republic’s T

Britain’s Andy Murray wipes his face during a pause of a match with Spain’s Marcel Granollers during their m

Switzerland’s Roger Federer returns the ball to France’s Benoit Paire during their semi final match at the I

Switzerland’s Roger Federer returns the ball to Poland’s Jerzy Janowicz during their match at the Italian Op

Serbia’s Novak Djokovic reacts after missing a point against Czech Republic’s Tomas Berdych during their mat

Spain’s Rafael Nadal celebrates after defeating Latvia’s Ernests Gulbis during their match at the Italian Op

Spain’s Rafael Nadal returns the ball to Italy’s Fabio Fognini during their match at the Italian Open tennis

Serena Williams, of the United States, returns the ball to Britain’s Laura Robson during their match at the Italia

Laura Robson of Britain returns the ball to Venus Williams of the United States during their match at the Italian Open t

Serena Williams from the U.S. reacts after winning a point during a match against Sara Errani from Italy at the Madrid O