Zhizhen Zhang defeated Tallon Griekspoor 6-4 in the s Hertogenbosch round of 16 on grass. The upset overturned the form book — Tallon Griekspoor came in ranked #58.
Zhang Z. won the match.
Griekspoor T. and Zhang Z. faced 3 of the same opponents in the last 12 months. Griekspoor T. went 2–2 (50%) against them, Zhang Z. 1–2 (33%). Only 1 of the comparisons are context-comparable — too few for a conclusion.
Only 3 common opponents — small sample, treat as indicative.
Zhizhen Zhang beat Tallon Griekspoor 4-6. Umpiry, "Tallon Griekspoor vs Zhizhen Zhang — s Hertogenbosch Round of 16", https://umpiry.com/match/2026-06-11/griekspoor-vs-zhang-s-hertogenbosch-r16?utm_source=cite (as of 11 June 2026).