Sloane Stephens

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Sloane Stephens returns against Elina Svitolina, of Ukraine, during the Family Circle Cup tennis tournament in Charleston, S.C., Wednesday, April 2, 2014. Svitolina defeated Stephens 6-4, 6-4. (AP Photo/Mic Smith)

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Elina Svitolina, of Ukraine, returns against Sloane Stephens during the Family Circle Cup tennis tournament in Charleston, S.C., Wednesday, April 2, 2014. Svitolina defeated Stephens 6-4, 6-4. (AP Photo/Mic Smith)

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Sloane Stephens returns against Elina Svitolina, of Ukraine, during the Family Circle Cup tennis tournament in Charleston, S.C., Wednesday, April 2, 2014. Svitolina defeated Stephens 6-4, 6-4. (AP Photo/Mic Smith)

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Sloane Stephens smiles prior to serving to Flavia Pennetta, of Italy, during a quarterfinal match at the BNP Paribas Open tennis tournament, Thursday, March 13, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Sloane Stephens, of the United States, serves to Flavia Pennetta, of Italy, during a quarterfinal at the BNP Paribas Open tennis tournament, Thursday, March 13, 2014 in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Sloane Stephens hits to Flavia Pennetta, of Italy, during a quarterfinal match at the BNP Paribas Open tennis tournament Thursday, March 13, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)