Daniel Nestor defeated Marcos Ondruska 5-7 7-6 6-4 in the Newport quarter-final on grass. The upset overturned the form book — Marcos Ondruska came in leading the head-to-head 1–0, defending last year's round of 16. Daniel Nestor claimed a first win over Marcos Ondruska in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-03-22 | USA 1 Masters 3 | SF | clay | Marcos Ondruska | 6-3 4-6 6-3 |
Averages over each player's completed matches in the selected window (114 vs 50). 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