David Caballero defeated Guillaume Marx 6-4 4-6 6-3 in the Italy F1 round of 32 on clay. The upset overturned the form book — Guillaume Marx came in leading the head-to-head 1–0. David Caballero claimed a first win over Guillaume Marx in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-03-24 | Italy F2 | QF | clay | Guillaume Marx | 6-0 6-2 |