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KEY BISCAYNE, FL - MARCH 24: Daria Kasatkina of Russia plays a backhand against Simona Halep of Romania in their second round match during the Miami Open Presented by Itau at Crandon Park Tennis Center on March 24, 2016 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)

KEY BISCAYNE, FL - MARCH 24:   Daria Kasatkina of Russia plays a backhand against Simona Halep of Romania in their second round match during the Miami Open Presented by Itau at Crandon Park Tennis Center on March 24, 2016 in Key Biscayne, Florida.  (Photo by Clive Brunskill/Getty Images)