Paul Haarhuis defeated Sjeng Schalken 0-6 6-4 6-3 in the Boston quarter-final on hard. The upset overturned the form book — Sjeng Schalken came in leading the head-to-head 2–0, defending the title. Paul Haarhuis claimed a first win over Sjeng Schalken in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-08-23 | Boston | R32 | hard | Sjeng Schalken | 4-6 6-3 6-0 |
| 1999-05-24 | Roland Garros | R128 | clay | Sjeng Schalken | 6-2 6-3 4-6 6-3 |
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 (59 vs 200). ATP, WTA & Challenger.