Martin Vassallo Arguello defeated Carlos Custodio 4-6 6-1 6-2 in the Argentina F4 round of 32 on clay. The result followed the form book — Martin Vassallo Arguello came in leading the head-to-head 1–0. Martin Vassallo Arguello extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-11-16 | Brazil F5 | R32 | clay | Martin Vassallo Arguello | 6-3 3-6 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.