Milos Raonic of Canada, returns the ball to Stanislas Wawrinka of Switzerland during their quarterfinals match of the Monte Carlo Tennis Masters tournament in Monaco, Friday, April 18, 2014. Wawrinka won 7-6 6-2. (AP Photo/Michel Euler)

Monte Carlo Tennis Masters

Milos Raonic of Canada, returns the ball to Stanislas Wawrinka of Switzerland during their quarterfinals match of the Monte Carlo Tennis Masters tournament in Monaco, Friday, April 18, 2014. Wawrinka won 7-6 6-2. (AP Photo/Michel Euler)

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