Head to head
1
Hard
1
1
Grass
0
Alex O'Brien's wins on the left · Marc-Kevin Goellner's on the right · bar lengths share one scale
All meetings (3)
| 1997 | New Haven | Hard | R32 | Marc-Kevin Goellner | 7-5 6-3 |
| 1997 | Nottingham | Grass | R16 | Alex O'Brien | 7-6(4) 6-3 |
| 1996 | Adelaide | Hard | R32 | Alex O'Brien | 6-7(5) 6-4 7-6(9) |
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.