Stefanos Tsitsipas defeated Borna Coric 6-0 6-7 7-5 in the United Cup quarter-final on hard. The upset overturned the form book — Borna Coric came in leading the head-to-head 3–2, defending last year's round-robin, but Stefanos Tsitsipas had been the form player, winning 3 of their last 4 on hard. That levelled the head-to-head at 3–3.
Tsitsipas S. came through in three sets.
Tsitsipas S. and Coric B. faced 11 of the same opponents in the last 12 months. Tsitsipas S. went 15–1 (94%) against them, Coric B. 4–8 (33%). Tsitsipas S. came out clearly better against 7 of 11 comparable opponents, Coric B. against 0 — though 1 of those edges carries caveats (lower-tier event).
Hard: Coric B. leads 3–2 · Clay: Tsitsipas S. leads 1–0
Stefanos Tsitsipas beat Borna Coric 6-0 6-7(4) 7-5. Umpiry, "Stefanos Tsitsipas vs Borna Coric — United Cup Quarter-final", https://umpiry.com/match/2023-01-04/coric-vs-tsitsipas-united-cup-qf?utm_source=cite (as of 4 January 2023).