Sjeng Schalken defeated Jan Siemerink 6-3 6-4 in the s Hertogenbosch round of 32 on grass. The upset overturned the form book — Jan Siemerink came in leading the head-to-head 3–1, defending last year's round of 16. Sjeng Schalken narrowed the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2001-07-16 | Amsterdam | R16 | clay | Sjeng Schalken | 3-6 6-4 6-4 |
| 2001-01-15 | Australian Open | R128 | hard | Jan Siemerink | 2-6 6-3 6-4 3-6 6-3 |
| 1998-08-10 | Cincinnati Masters | R64 | hard | Jan Siemerink | 1-6 6-1 7-6(2) |
| 1997-10-20 | Stuttgart Masters | R64 | carpet | Jan Siemerink | 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 (200 vs 30). ATP, WTA & Challenger.