Milos Raonic of Canada returns the ball to Yen-Hsun Lu of Taiwan during their match of the Monte Carlo Tennis Masters tournament in Monaco, Wednesday, April 16, 2014. (AP Photo/Michel Euler)
Roger Federer of Switzerland, returns the ball to Radek Stepanek Czech Republic during their match at the Monte Carlo Tennis Masters tournament in Monaco, Wednesday, April 16, 2014. (AP Photo/Michel Euler)
Roger Federer of Switzerland, returns the ball to Radek Stepanek Czech Republic during their match at the Monte Carlo Tennis Masters tournament in Monaco, Wednesday, April 16, 2014. (AP Photo/Michel Euler)
Novak Djokovic of Serbia acknowledges applause after defeating Albert Montanes of Spain in 6-1 6-0, during their match at the Monte Carlo Tennis Masters tournament in Monaco, Tuesday, April 15, 2014. (AP Photo/Michel Euler)