Diego Del Rio defeated Horacio Pacheco 3-6 6-2 6-2 in the Chile Masters 1 qualifying round on clay. The upset overturned the form book — Horacio Pacheco came in leading the head-to-head 2–0. Diego Del Rio claimed a first win over Horacio Pacheco in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-11-18 | Arg Uru Par Masters 2 | R32 | clay | Horacio Pacheco | 6-4 6-3 |
| 1991-11-18 | Arg Uru Par Masters 4 | R16 | clay | Horacio Pacheco | 6-4 6-3 |