Nikolay Davydenko defeated Sjeng Schalken 6-3 6-1 in the St. Poelten round of 16 on clay. The upset overturned the form book — Sjeng Schalken came in leading the head-to-head 2–1. Nikolay Davydenko narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-02-07 | Marseille | R32 | hard | Sjeng Schalken | 3-6 6-4 6-1 |
| 2003-04-07 | Estoril | R32 | clay | Nikolay Davydenko | 6-3 6-2 |
| 2001-08-13 | Washington | R32 | hard | Sjeng Schalken | 6-3 6-1 |
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 16). ATP, WTA & Challenger.