Antonio Prieto defeated Marcos Daniel 7-5 6-2 in the Brazil F3 qualifying round on hard. The upset overturned the form book — Marcos Daniel came in leading the head-to-head 1–0. Antonio Prieto claimed a first win over Marcos Daniel in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-07-27 | Brazil F2 | R32 | hard | Marcos Daniel | 1-6 6-3 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.