Head to head
Rivalry summary
Alex O'Brien and Jan-Michael Gambill met 2 times on the ATP tour between 1998 and 2000. Their head-to-head is level at 1–1. By surface, they are level 1–1 on hard.
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Hard
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Alex O'Brien's wins on the left · Jan-Michael Gambill's on the right · bar lengths share one scale
All meetings (2)
| 2000 | Washington | Hard | R32 | Jan-Michael Gambill | 6-3 5-7 7-5 |
| 1998 | Australian Open | Hard | R128 | Alex O'Brien | 3-6 7-5 6-1 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.