Guillaume Marx defeated Fabrice Betencourt 4-6 6-2 6-1 in the France F7 qualifying round on clay. The upset overturned the form book — Fabrice Betencourt came in leading the head-to-head 1–0, but Guillaume Marx had been the form player, winning 4 of their last 7 on clay. Guillaume Marx claimed a first win over Fabrice Betencourt in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-01-31 | France 2 Masters 1 | R16 | clay | Fabrice Betencourt | 6-3 7-5 |