Luis Herrera defeated Marcos Ondruska 7-6 4-6 7-6 in the Queen's Club round of 64 on grass. The upset overturned the form book — Marcos Ondruska came in leading the head-to-head 2–0, defending last year's round of 64. Luis Herrera claimed a first win over Marcos Ondruska in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1993-06-07 | Queen's Club | R32 | grass | Marcos Ondruska | 6-2 6-3 |
| 1992-07-13 | Washington | R64 | hard | Marcos Ondruska | 7-5 6-1 |
Averages over each player's completed matches in the selected window (7 vs 49). 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. About