Oscar Martinez Dieguez defeated Didac Perez 6-3 6-4 in the Spain 3 Masters 4 round of 16 on clay. The upset overturned the form book — Didac Perez came in leading the head-to-head 1–0, but Oscar Martinez Dieguez had been the form player, winning 6 of their last 10 on clay. Oscar Martinez Dieguez claimed a first win over Didac Perez in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-10-15 | Spain 7 Masters 2 | R32 | clay | Didac Perez | 7-5 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.