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NEW YORK, NY - AUGUST 31: Eugenie Bouchard celebrates after winning the first set against Alison Riske of the United States during their Woman's Singles First Round match on Day One of the 2015 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)

NEW YORK, NY - AUGUST 31:  Eugenie Bouchard celebrates after winning the first set against Alison Riske of the United States during their Woman's Singles First Round match on Day One of the 2015 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2015 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Clive Brunskill/Getty Images)