Marta Kostyuk defeated Daniela Seguel 1-6 6-4 6-2 in the Australian Open qualifying round of 64 on hard. The upset overturned the form book — Daniela Seguel came in leading the head-to-head 1–0, but Marta Kostyuk had been the form player, winning 4 of their last 6 on hard. Marta Kostyuk claimed a first win over Daniela Seguel in two meetings, levelling the head-to-head at 1–1.
Kostyuk M. came through in three sets.
Hard: Kostyuk M. leads 1–0 · Clay: Seguel D. leads 1–0
Marta Kostyuk beat Daniela Seguel 1-6 6-4 6-2. Umpiry, "Marta Kostyuk vs Daniela Seguel — Australian Open Qualifying Round of 64", https://umpiry.com/match/2018-01-13/kostyuk-vs-seguel-australian-open-q64?utm_source=cite (as of 13 January 2018).