Maximilian Abel defeated Melvyn Op Der Heijde 6-7 6-1 6-1 in the Qatar F1 round of 16 on hard. The upset overturned the form book — Melvyn Op Der Heijde came in leading the head-to-head 1–0. Maximilian Abel claimed a first win over Melvyn Op Der Heijde in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-07-26 | Germany F9 | R16 | clay | Melvyn Op Der Heijde | 6-1 6-4 |