No. 17 seed Maria Sakkari of Greece recorded nine aces while posting a 6-4, 6-3 upset victory over 10th-seeded Petra Kvitova on Saturday in New York to reach the round of 16 at the U.S. Open. Sakkari had 19 winners against 16 unforced errors while playing a cleaner game than two-time Wimbledon champion Kvitova. The Czech Republic native committed 34 unforced errors while accumulating just 16 winners. Perhaps most impres
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