Zhizhen Zhang defeated Nuno Borges 7-5 6-4 in the CHN vs POR round robin on hard. The upset overturned the form book — Nuno Borges came in ranked #51.
Zhang Z. took it in straight sets.
Zhang Z. and Borges N. faced 3 of the same opponents in the last 12 months. Zhang Z. went 1–2 (33%) against them, Borges N. 2–1 (67%). Only 2 of the comparisons are context-comparable — too few for a conclusion.
Only 3 common opponents — small sample, treat as indicative.
Zhizhen Zhang beat Nuno Borges 7-5 6-4. Umpiry, "Zhizhen Zhang vs Nuno Borges — CHN vs POR Round Robin", https://umpiry.com/match/2026-02-06/borges-vs-zhang-chn-vs-por-rr?utm_source=cite (as of 6 February 2026).