Head to head
1
Hard
1
0
Grass
1
Alex O'Brien's wins on the left · Nicolas Pereira's on the right · bar lengths share one scale
All meetings (3)
| 1996 | Los Angeles | Hard | R32 | Alex O'Brien | 6-2 6-3 |
| 1995 | San Jose | Hard | R32 | Nicolas Pereira | 7-5 6-4 |
| 1993 | Manchester | Grass | R32 | Nicolas Pereira | 6-7(6) 6-3 7-6(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.