Adolfo Daniel Vallejo defeated Tomas Farjat 6-3 6-2 in the M25 Rosario-Santa Fe 1 semi-final on clay. The upset overturned the form book — Tomas Farjat came in leading the head-to-head 1–0, but Adolfo Daniel Vallejo had been the form player, winning 9 of their last 10 on clay. Adolfo Daniel Vallejo claimed a first win over Tomas Farjat in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-08-21 | M15 Lambare 1 | R32 | clay | Tomas Farjat | 6-2 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.