Stefan Koubek defeated Nikolay Davydenko 6-2 4-6 7-6 in the Vienna round of 32 on hard. The upset overturned the form book — Nikolay Davydenko came in leading the head-to-head 1–0, defending last year's quarter-final. Stefan Koubek claimed a first win over Nikolay Davydenko in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-05-25 | Roland Garros | R128 | clay | Nikolay Davydenko | 6-2 6-1 6-4 |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Averages over each player's completed matches in the selected window (200 vs 200). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About