Stefan Koubek defeated Kristof Vliegen 6-2 3-6 6-4 in the Sopot round of 16 on clay. The upset overturned the form book — Kristof Vliegen came in leading the head-to-head 1–0. Stefan Koubek claimed a first win over Kristof Vliegen in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-04-26 | Barcelona | R64 | clay | Kristof Vliegen | 6-4 6-2 |
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 (82 vs 91). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About