Sebastian Prieto defeated Gustavo Diaz 6-2 6-3 in the Chile 1 Masters 3 qualifying round on clay. The result followed the form book — Sebastian Prieto came in leading the head-to-head 3–0. Sebastian Prieto extended the head-to-head to 4–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1995-08-05 | Argentina B Masters 1 | SF | clay | Sebastian Prieto | 4-6 6-4 7-5 |
| 1994-07-16 | Argentina 2 Masters 1 | R16 | clay | Sebastian Prieto | 0-6 6-4 6-2 |
| 1993-04-10 | Argentina 1 Masters 1 | R32 | clay | Sebastian Prieto | 7-6 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.