Pedro Nieto defeated Juan Antonio Saiz Panadero 6-4 6-4 in the Spain 4 Masters 1 round of 32 on clay. The upset overturned the form book — Juan Antonio Saiz Panadero came in leading the head-to-head 2–0, but Pedro Nieto had been the form player, winning 2 of their last 7 on clay. Pedro Nieto claimed a first win over Juan Antonio Saiz Panadero in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-08-31 | Spain F8 | QF | clay | Juan Antonio Saiz Panadero | 2-6 6-0 6-1 |
| 1998-05-08 | Spain 5 Masters 2 | R16 | clay | Juan Antonio Saiz Panadero | 3-6 6-4 6-0 |