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STUTTGART, GERMANY - APRIL 26: Naomi Osaka of Japan in action against Donna Vekic of Croatia during their quarterfinal match on day 5 of the Porsche Tennis Grand Prix at Porsche-Arena on April 26, 2019 in Stuttgart, Germany. (Photo by Daniel Kopatsch/Getty Images)

STUTTGART, GERMANY - APRIL 26: Naomi Osaka of Japan in action against Donna Vekic of Croatia during their quarterfinal match on day 5 of the Porsche Tennis Grand Prix at Porsche-Arena on April 26, 2019 in Stuttgart, Germany. (Photo by Daniel Kopatsch/Getty Images)
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Getty Images Sport Daniel Kopatsch