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SAINT PETERSBURG, RUSSIA - FEBRUARY 03: Daria Kasatkina of Russia returns the ball to Kristina Mladenovic of France during their St. Petersburg Ladies Trophy 2018 semi-final tennis match on February 3, 2018 in Saint Petersburg, Russia. (Photo by Mike Kireev/Epsilon/Getty Images)

SAINT PETERSBURG, RUSSIA - FEBRUARY 03: Daria Kasatkina of Russia returns the ball to Kristina Mladenovic of France during their St. Petersburg Ladies Trophy 2018 semi-final tennis match on February 3, 2018 in Saint Petersburg, Russia. (Photo by Mike Kireev/Epsilon/Getty Images)
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