Marin Čilić

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Marin Cilic, of Croatia, returns a shot to Novak Djokovic, of Serbia, during their match at the BNP Paribas Open tennis tournament, Wednesday, March 12, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Kevin Anderson returns the ball hit by Marin Cilic during the Delray Beach Open tennis tournament, Sunday, Feb. 23, 2014, in Delray Beach, Fla. Cilic won 7-6 (6), 6-7 (7), 6-4. (AP Photo/J Pat Carter)

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Marin Cilic, of Croatia, displays the winner's trophy after defeating Kevin Anderson in the Delray Beach Open tennis tournament, Sunday, Feb. 23, 2014, in Delray Beach, Fla. Cilic won 7-6 (6), 6-7 (7), 6-4. (AP Photo/J Pat Carter)

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Marin Cilic, of Croatia, returns the ball to Kevin Anderson during the Delray Beach Open tennis tournament, Sunday, Feb. 23, 2014, in Delray Beach, Fla. Cilic won 7-6 (6), 6-7 (7), 6-4. (AP Photo/J Pat Carter)

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Kevin Anderson watches his ball as he hits the ball back to Marin Cilic during the Delray Beach Open tennis tournament, Sunday, Feb. 23, 2014, in Delray Beach, Fla. Cilic won 7-6 (6), 6-7 (7), 6-4. (AP Photo/J Pat Carter)

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Marin Cilic, of Croatia, returns the ball to Kevin Anderson during the Delray Beach Open tennis tournament, Sunday, Feb. 23, 2014, in Delray Beach, Fla. Cilic won 7-6 (6), 6-7 (7), 6-4. (AP Photo/J Pat Carter)