Stefanos Tsitsipas defeated Jannik Sinner 6-3 6-3 in the Barcelona semi-final on clay. The upset overturned the form book — Jannik Sinner came in ranked #1. Stefanos Tsitsipas moved ahead in the head-to-head, 2–1.
Tsitsipas S. took it in straight sets.
Tsitsipas S. and Sinner J. faced 7 of the same opponents in the last 12 months. Tsitsipas S. went 5–3 (63%) against them, Sinner J. 3–4 (43%). Tsitsipas S. came out better against 2 of 6 comparable opponents, Sinner J. against 0.
Stefanos Tsitsipas beat Jannik Sinner 6-3 6-3. Umpiry, "Stefanos Tsitsipas vs Jannik Sinner — Barcelona Semi-final", https://umpiry.com/match/2021-04-19/sinner-vs-tsitsipas-barcelona-sf?utm_source=cite (as of 19 April 2021).