Kichenok and Ostapenko defeated Nicole Melichar-Martinez and Ellen Perez 7-6(5), 6-3 in one hour and 24 minutes to capture the WTA 1000 title in Cincinnati.
Playing just their third tournament together as a team, Zhang and Mertens needed one hour and 42 minutes to successfully fend off a comeback by the Americans 6-2, 3-6, 6-3.
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