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American wild-card entry Kristie Ahn shocked Jelena Ostapenko 6-3, 7-5 in the third round of the U.S. Open on Saturday. Though Ostapenko flaunted her strong serve with eight aces, it also was the root of her struggles with 12 double faults to Ahn’s three. It was a sloppier match for Ostapenko, who committed 45 unforced...