Mark Joachim defeated Victor Sendin 6-2 6-3 in the Spain 4 Masters 2 round of 16 on clay. The upset overturned the form book — Victor Sendin came in leading the head-to-head 1–0. Mark Joachim claimed a first win over Victor Sendin in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-04-09 | Spain 4 Masters 1 | QF | clay | Victor Sendin | 7-5 6-1 |