Bas Van Der Valk defeated Boy Westerhof 6-2 6-1 in the Netherlands F5 round of 32 on clay. The upset overturned the form book — Boy Westerhof came in leading the head-to-head 1–0. Bas Van Der Valk claimed a first win over Boy Westerhof in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-06-09 | Netherlands F1 | R16 | clay | Boy Westerhof | 6-7(8) 6-1 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.