Sjeng Schalken defeated Daniel Vacek 6-4 6-4 in the Auckland round of 16 on hard. The upset overturned the form book — Daniel Vacek came in leading the head-to-head 2–0, defending last year's round of 32, but Sjeng Schalken had been the form player, winning 2 of their last 4 on hard. Sjeng Schalken claimed a first win over Daniel Vacek in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-08-03 | Canada Masters | R64 | hard | Daniel Vacek | 4-6 6-3 6-4 |
| 1998-05-25 | Roland Garros | R128 | clay | Daniel Vacek | 1-6 6-2 6-4 7-5 |
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 86). ATP, WTA & Challenger.