German Lopez defeated Oscar Martinez Dieguez 6-7 6-3 6-4 in the Spain 1 Masters 4 round of 16 on clay. The upset overturned the form book — Oscar Martinez Dieguez came in leading the head-to-head 2–0. German Lopez claimed a first win over Oscar Martinez Dieguez in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1997-01-31 | Spain 2 Masters 4 | R32 | clay | Oscar Martinez Dieguez | 6-3 3-6 6-3 |
| 1994-02-04 | Spain 1 Masters 1 | QF | hard | Oscar Martinez Dieguez | 6-1 1-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.