Leonardo Olguin defeated Marcos Daniel 1-6 7-6 6-3 in the Chile 1 Masters 4 qualifying round on clay. The upset overturned the form book — Marcos Daniel came in leading the head-to-head 1–0. Leonardo Olguin claimed a first win over Marcos Daniel in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-04-10 | Chile 1 Masters 3 | SF | clay | Marcos Daniel | 6-2 6-4 |
Averages over each player's completed matches in the selected window (1 vs 81). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. Small sample — read as indicative. About