Justin Gimelstob defeated Daniel Vacek 6-2 3-6 2-6 6-4 6-3 in the US Open round of 64 on hard. Justin Gimelstob extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2001-10-01 | Tokyo | Q16 | hard | Daniel Vacek | 6-1 6-1 |
| 1998-07-27 | Los Angeles | R32 | hard | Justin Gimelstob | 6-4 6-0 |
Averages over each player's completed matches in the selected window (194 vs 85). 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