Tommy Haas defeated Nikolay Davydenko 6-3 2-6 1-6 6-1 7-5 in the Australian Open quarter-final on hard. The upset overturned the form book — Nikolay Davydenko came in leading the head-to-head 4–0, defending last year's quarter-final. Tommy Haas claimed a first win over Nikolay Davydenko in five meetings, narrowing the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-07-21 | Canada Masters | R32 | hard | Nikolay Davydenko | 6-3 7-6(6) |
| 2007-08-27 | US Open | QF | hard | Nikolay Davydenko | 6-3 6-3 6-4 |
| 2006-08-28 | US Open | QF | hard | Nikolay Davydenko | 4-6 6-7(3) 6-3 6-4 6-4 |
| 2005-05-23 | Roland Garros | R32 | clay | Nikolay Davydenko | 7-5 6-0 6-0 |
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