Arthur Rinderknech defeated Joao Sousa 7-5 6-4 in the Belgrade qualifying round 2 on hard. The upset overturned the form book — Joao Sousa came in leading the head-to-head 1–0. Arthur Rinderknech claimed a first win over Joao Sousa in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-05-17 | Lyon | Q2 | clay | Joao Sousa | 6-4 3-6 6-3 |
Averages from each player's recent completed matches (19 vs 20). ATP, WTA & Challenger.