Head to head
2
Hard
2
1
Clay
1
0
Grass
1
Michael Chang's wins on the left · Jan-Michael Gambill's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (7)
| 2002 | Los Angeles | Hard | R32 | Jan-Michael Gambill | 4-6 6-2 7-6(7) |
| 2002 | Queen's Club | Grass | R64 | Jan-Michael Gambill | 7-5 6-3 |
| 2000 | Los Angeles | Hard | F | Michael Chang | 6-7(2) 6-3 RET |
| 2000 | Hamburg Masters | Clay | R64 | Jan-Michael Gambill | 7-5 7-5 |
| 1999 | Singapore | Hard | R16 | Jan-Michael Gambill | 6-2 7-6(4) |
| 1999 | Shanghai | Hard | QF | Michael Chang | 6-3 7-5 |
| 1997 | Orlando | Clay | R32 | Michael Chang | 6-3 6-3 |
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.