Mark Nielsen defeated Yaoki Ishii 6-2 6-3 in the Japan F1 round of 16 on clay. The upset overturned the form book — Yaoki Ishii came in leading the head-to-head 1–0. Mark Nielsen claimed a first win over Yaoki Ishii in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-10-25 | Japan F6 | F | carpet | Yaoki Ishii | 6-4 2-6 6-2 |
Averages over each player's completed matches in the selected window (10 vs 4). 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. About