Ying Ying Duan defeated Maria Sakkari 6-4 4-6 6-3 in the US Open round of 128 on hard. The upset overturned the form book — Maria Sakkari came in defending last year's round of 128.
Duan Y. came through in three sets.
Duan Y. and Sakkari M. faced 1 of the same opponent in the last 12 months. Duan Y. went 0–1 (0%) against them, Sakkari M. 0–1 (0%).
Only 1 common opponent — too few for any conclusion. Shown without assessment.
Ying Ying Duan beat Maria Sakkari 6-4 4-6 6-3. Umpiry, "Ying Ying Duan vs Maria Sakkari — US Open Round of 128", https://umpiry.com/match/2016-08-29/duan-vs-sakkari-us-open-r128?utm_source=cite (as of 29 August 2016).