Head to head
3
Hard
3
0
Clay
1
1
Grass
0
Jan-Michael Gambill's wins on the left · Justin Gimelstob's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (8)
| 2005 | Chennai | Hard | R32 | Justin Gimelstob | 6-3 6-3 |
| 2003 | Delray Beach | Hard | R16 | Jan-Michael Gambill | 7-5 7-5 |
| 2001 | Queen's Club | Grass | R32 | Jan-Michael Gambill | 6-3 7-5 |
| 2000 | San Jose | Hard | R32 | Justin Gimelstob | 7-6(2) 6-2 |
| 1999 | Singapore | Hard | R32 | Jan-Michael Gambill | 7-6(2) 6-4 |
| 1999 | Atlanta | Clay | R32 | Justin Gimelstob | 6-0 6-4 |
| 1999 | Scottsdale | Hard | QF | Jan-Michael Gambill | 4-6 6-4 6-1 |
| 1999 | San Jose | Hard | R32 | Justin Gimelstob | 6-3 7-6(6) |
Methodology
Head-to-head totals and surface splits exclude walkovers (no match was played), which follows ATP convention — walkover meetings still appear in the match list. The momentum chart plots the running lead across all counted meetings, oldest to newest.