Head to head
3
Hard
1
2
Clay
1
2
Grass
1
4
Carpet
3
Tom Okker's wins on the left · Mark Cox's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (17)
| 1979 | Vienna | Hard | R32 | Mark Cox | 6-1 6-2 |
| 1977 | Rotterdam WCT | Carpet | R16 | Mark Cox | 6-3 4-6 6-3 |
| 1973 | London-3 | Carpet | SF | Tom Okker | 6-0 7-6 |
| 1973 | Toronto-2 | Clay | R16 | Tom Okker | 4-6 6-4 6-4 |
| 1972 | Vancouver WCT | Carpet | QF | Mark Cox | 4-6 6-3 6-4 |
| 1972 | Alamo WCT | Hard | QF | Tom Okker | 6-1 1-6 7-6 |
| 1972 | Cleveland WCT | Carpet | R16 | Mark Cox | 6-3 6-4 |
| 1971 | Cologne WCT | Carpet | QF | Tom Okker | 6-3 6-4 |
| 1971 | Bristol WCT | Grass | R16 | Tom Okker | 6-0 6-2 |
| 1971 | Rome WCT | Clay | R32 | Tom Okker | 6-3 7-5 |
| 1971 | London-1 | Carpet | R32 | Tom Okker | 6-3 6-0 |
| 1970 | Leicester | Grass | QF | Tom Okker | 21-19 6-4 |
| 1969 | Wembley | Carpet | R32 | Tom Okker | 6-2 19-21 6-4 |
| 1969 | US Open | Grass | R128 | Mark Cox | 7-9 6-3 0-6 6-4 9-7 |
| 1968 | Munich | Clay | QF | Mark Cox | 8-10 4-6 6-1 6-4 6-4 |
| 1968 | Curacao | Hard | SF | Tom Okker | 6-4 4-6 6-0 |
| 1968 | Kingston | Hard | SF | Tom Okker | 6-1 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.