Simon Greul defeated Jordi Mas 7-6 5-7 6-1 in the Germany F1 round of 32 on clay. The upset overturned the form book — Jordi Mas came in leading the head-to-head 1–0, but Simon Greul had been the form player, winning 3 of their last 6 on clay. Simon Greul claimed a first win over Jordi Mas in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-05-31 | Germany F4B | R32 | clay | Jordi Mas | 6-2 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.