Head to head
0
Hard
3
1
Clay
0
0
Grass
1
Alex O'Brien's wins on the left · Jonathan Stark's on the right · bar lengths share one scale
All meetings (5)
| 1995 | Memphis | Hard | R64 | Jonathan Stark | 6-4 6-7(5) 6-1 |
| 1994 | Oahu | Hard | R32 | Jonathan Stark | 7-6(4) 6-2 |
| 1993 | Tampa | Clay | R32 | Alex O'Brien | 6-4 6-4 |
| 1993 | Adelaide | Hard | QF | Jonathan Stark | 6-2 6-1 |
| 1992 | Newport | Grass | R32 | Jonathan Stark | 6-3 6-4 |
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.