Gustavo Heide defeated Jan Choinski 3-6 6-4 in the Poznan quarter-final on clay. The upset overturned the form book — Jan Choinski came in ranked #91.
Heide G. won the match.
Gustavo Heide beat Jan Choinski 3-6 6-4. Umpiry, "Gustavo Heide vs Jan Choinski — Poznan Quarter-final", https://umpiry.com/match/2026-06-18/choinski-vs-heide-poznan-qf?utm_source=cite (as of 18 June 2026).