Mackenzie Mcdonald defeated Yannick Hanfmann 2-6 6-4 6-2 in the USA F1 semi-final on hard. The upset overturned the form book — Yannick Hanfmann came in ranked #57. Mackenzie Mcdonald extended the head-to-head to 2–0.
McDonald M. came through in three sets.
Mackenzie Mcdonald beat Yannick Hanfmann 2-6 6-4 6-2. Umpiry, "Mackenzie Mcdonald vs Yannick Hanfmann — USA F1 Semi-final", https://umpiry.com/match/2017-01-02/hanfmann-vs-mcdonald-usa-f1-sf?utm_source=cite (as of 2 January 2017).