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PARIS, FRANCE - MAY 30: Borna Coric of Croatia returns a shot during his men's singles match against Jack Sock of the United States on day seven of the 2015 French Open at Roland Garros on May 30, 2015 in Paris, France. (Photo by Dan Istitene/Getty Images)

PARIS, FRANCE - MAY 30: Borna Coric of Croatia returns a shot during his men's singles match against Jack Sock of the United States on day seven of the 2015 French Open at Roland Garros on May 30, 2015 in Paris, France. (Photo by Dan Istitene/Getty Images)
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Getty Images Sport Dan Istitene