Stefanos Tsitsipas defeated Isaac Frost 6-4 5-7 6-2 in the Greece F9 qualifying round on hard. The upset overturned the form book — Isaac Frost came in leading the head-to-head 1–0, but Stefanos Tsitsipas had been the form player, winning 8 of their last 10 on hard. Stefanos Tsitsipas claimed a first win over Isaac Frost in two meetings, levelling the head-to-head at 1–1.
Tsitsipas S. came through in three sets.
Stefanos Tsitsipas beat Isaac Frost 6-4 5-7 6-2. Umpiry, "Stefanos Tsitsipas vs Isaac Frost — Greece F9 Qualifying Round", https://umpiry.com/match/2015-10-26/frost-vs-tsitsipas-greece-f9-qf?utm_source=cite (as of 26 October 2015).