Stefan Wauters defeated Igor Sijsling 3-6 6-3 7-6 in the Netherlands F4 round of 32 on clay. The upset overturned the form book — Igor Sijsling came in leading the head-to-head 2–0. Stefan Wauters claimed a first win over Igor Sijsling in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-07-24 | Belgium F2 | F | clay | Igor Sijsling | 6-4 6-4 |
| 2006-06-26 | Netherlands F3 | F | clay | Igor Sijsling | 7-6(2) 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.