Boy Westerhof defeated Michel Koning 6-4 6-4 in the Netherlands F6 round of 32 on clay. The upset overturned the form book — Michel Koning came in leading the head-to-head 2–0. Boy Westerhof claimed a first win over Michel Koning in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-08-25 | Netherlands F5 | SF | clay | Michel Koning | 7-6(5) 6-1 |
| 2006-06-19 | Netherlands F2 | R32 | clay | Michel Koning | 6-4 6-1 |
Averages over each player's completed matches in the selected window (47 vs 1). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. Small sample — read as indicative. About