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NEW YORK, NY - AUGUST 31: Monica Niculescu of Romania returns a shot to Ana Bogdan of Romania during her second round Women's Singles match on Day Three of the 2016 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)

NEW YORK, NY - AUGUST 31:  Monica Niculescu of Romania returns a shot to Ana Bogdan of Romania during her second round Women's Singles match on Day Three of the 2016 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2016 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Elsa/Getty Images)

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NEW YORK, NY - AUGUST 31: Monica Niculescu of Romania returns a shot to Ana Bogdan of Romania during her second round Women's Singles match on Day Three of the 2016 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)

NEW YORK, NY - AUGUST 31:  Monica Niculescu of Romania returns a shot to Ana Bogdan of Romania during her second round Women's Singles match on Day Three of the 2016 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2016 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Elsa/Getty Images)

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NEW YORK, NY - AUGUST 31: Monica Niculescu of Romania returns a shot to Ana Bogdan of Romania during her second round Women's Singles match on Day Three of the 2016 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)

NEW YORK, NY - AUGUST 31:  Monica Niculescu of Romania returns a shot to Ana Bogdan of Romania during her second round Women's Singles match on Day Three of the 2016 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2016 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Elsa/Getty Images)