Head to head
1
Hard
1
1
Clay
0
1
Grass
0
1
Carpet
0
Tom Okker's wins on the left · Robert Maud's on the right · bar lengths share one scale
All meetings (5)
| 1972 | Montreal WCT | Carpet | R32 | Tom Okker | 2-6 7-6 6-3 |
| 1972 | Boston WCT | Hard | R32 | Tom Okker | 6-3 6-2 |
| 1970 | Hilversum | Clay | QF | Tom Okker | 8-6 4-6 13-11 |
| 1970 | Leicester | Grass | R16 | Tom Okker | 3-6 13-11 6-3 |
| 1968 | Durban-1 | Hard | QF | Robert Maud | 9-7 6-2 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.