Marin Cilic of Croatia returns the ball to Stanislas Wawrinka of Switzerland during their match of the Monte Carlo Tennis Masters tournament in Monaco, Wednesday, April 16, 2014. Wawrinka won 6-0 6-2. (AP Photo/Michel Euler)

Monte Carlo Tennis Masters

Marin Cilic of Croatia returns the ball to Stanislas Wawrinka of Switzerland during their match of the Monte Carlo Tennis Masters tournament in Monaco, Wednesday, April 16, 2014. Wawrinka won 6-0 6-2. (AP Photo/Michel Euler)

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