Zach Dailey defeated Dawid Olejniczak 6-3 3-6 6-3 in the Mexico F13 qualifying round on hard. The upset overturned the form book — Dawid Olejniczak came in leading the head-to-head 2–0. Zach Dailey claimed a first win over Dawid Olejniczak in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-10-03 | Mexico F13 | QF | hard | Dawid Olejniczak | 7-5 7-5 |
| 2004-10-04 | Mexico F12 | R32 | hard | Dawid Olejniczak | 6-4 6-3 |
Averages over each player's completed matches in the selected window (1 vs 3). 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