Gauff saves three set points to beat Kostyuk and keep WTA Finals hopes alive

American saves three set points in second-set rally Gauff wins six straight games to seal 6-4, 7-5 victory World No 4 needs Noskova help to reach last four Coco Gauff clawed out a 6-4, 7-5 round-robin victory over Marta Kostyuk on Thursday to keep her WTA Finals hopes alive in…

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