Michael Zhu defeated Hillel Rousseau 6-3 6-1 in the M25 Portimao 1 q16 on hard. The upset overturned the form book — Hillel Rousseau came in leading the head-to-head 1–0. Michael Zhu claimed a first win over Hillel Rousseau in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-10-18 | M25 Quinta Do Lago 1 | Q32 | hard | Hillel Rousseau | 6-4 3-6 10-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.