Oscar Martinez Dieguez defeated Diego Hipperdinger 6-2 6-3 in the Spain 5 Masters 1 round of 32 on clay. The upset overturned the form book — Diego Hipperdinger came in leading the head-to-head 1–0. Oscar Martinez Dieguez claimed a first win over Diego Hipperdinger in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1997-07-04 | Spain 6 Masters 3 | SF | clay | Diego Hipperdinger | 6-4 7-6 |