Guy Den Heijer defeated Jesper De Jong 6-4 4-6 6-0 in the M15 Brussels 1 semi-final on clay. The upset overturned the form book — Jesper De Jong came in leading the head-to-head 2–0. Guy Den Heijer claimed a first win over Jesper De Jong in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-03-09 | M25 Quinta Do Lago 1 | R32 | hard | Jesper De Jong | 6-3 6-1 |
| 2019-03-13 | M15 Doha 2 | R16 | hard | Jesper De Jong | 7-5 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.
De Jong J.: 5 days rest · 1 match, 26 games (7d). Higher means fresher. About