Head to head
0
Hard
1
3
Clay
2
2
Grass
1
7
Carpet
3
Tom Okker's wins on the left · Cliff Drysdale's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (19)
| 1977 | Birmingham WCT | Carpet | R16 | Cliff Drysdale | 6-1 7-5 |
| 1976 | Columbus WCT | Carpet | QF | Cliff Drysdale | 3-6 7-6(5) 7-6(5) |
| 1974 | Wimbledon | Grass | R32 | Tom Okker | 4-6 6-3 6-3 6-3 |
| 1974 | Rotterdam WCT | Carpet | SF | Tom Okker | 6-3 3-6 6-3 |
| 1974 | Miami WCT | Carpet | SF | Cliff Drysdale | 6-0 1-6 7-5 |
| 1974 | Toronto WCT | Carpet | R16 | Tom Okker | 6-3 6-4 |
| 1972 | Rome WCT | Carpet | 3rd/4th | Tom Okker | 6-3 7-5 |
| 1972 | Montreal WCT | Carpet | QF | Tom Okker | 4-6 7-5 6-2 |
| 1972 | Louisville WCT | Clay | QF | Cliff Drysdale | 7-5 7-5 |
| 1971 | Boston WCT | Hard | QF | Cliff Drysdale | 6-4 4-6 6-4 |
| 1971 | Louisville WCT | Clay | F | Tom Okker | 3-6 6-4 6-1 |
| 1971 | Bristol WCT | Grass | QF | Cliff Drysdale | 7-6 6-7 7-6 |
| 1971 | Rome WCT | Clay | QF | Tom Okker | 6-3 6-4 |
| 1971 | Dallas WCT | Carpet | QF | Tom Okker | 6-3 6-7 6-3 |
| 1970 | Vancouver | Carpet | QF | Tom Okker | 6-3 6-4 |
| 1970 | Leicester | Grass | SF | Tom Okker | 6-3 8-6 |
| 1970 | London-1 | Carpet | QF | Tom Okker | 6-3 6-2 |
| 1969 | Hamburg | Clay | SF | Tom Okker | 4-6 6-3 3-6 6-4 |
| 1968 | Gstaad | Clay | F | Cliff Drysdale | 6-3 6-3 6-0 |
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.