Daniel Vacek defeated Justin Gimelstob 6-1 6-1 in the Tokyo q16 on hard. The upset overturned the form book — Justin Gimelstob came in leading the head-to-head 2–0. Daniel Vacek claimed a first win over Justin Gimelstob in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-08-30 | US Open | R64 | hard | Justin Gimelstob | 6-2 3-6 2-6 6-4 6-3 |
| 1998-07-27 | Los Angeles | R32 | hard | Justin Gimelstob | 6-4 6-0 |
Averages over each player's completed matches in the selected window (11 vs 122). 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