Head to head
2
Hard
2
0
Grass
1
0
Carpet
1
Alex O'Brien's wins on the left · Richard Krajicek's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (6)
| 1998 | US Open | Hard | R64 | Richard Krajicek | 6-1 7-6(5) 6-2 |
| 1998 | Canada Masters | Hard | R16 | Richard Krajicek | 3-6 6-2 6-3 |
| 1995 | Tokyo Indoor | Carpet | R32 | Richard Krajicek | 7-5 7-6(4) |
| 1995 | Rosmalen | Grass | R16 | Richard Krajicek | 6-3 6-3 |
| 1993 | Adelaide | Hard | R16 | Alex O'Brien | 6-4 6-4 |
| 1992 | New Haven | Hard | R32 | Alex O'Brien | 7-6(3) 7-6(2) |
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.