Nicolas Kiefer defeated Jan Siemerink 6-4 6-2 in the Halle quarter-final on grass. Nicolas Kiefer extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2001-04-06 | Davis Cup WG QF: NED vs GER | RR | carpet | Jan Siemerink | 6-3 7-6(5) 3-6 6-3 |
| 1997-02-17 | Antwerp | R32 | hard | Nicolas Kiefer | 3-6 6-4 7-5 |
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 91). ATP, WTA & Challenger.