Head to head
1
Hard
2
1
Clay
0
0
Grass
1
2
Carpet
3
Jeff Borowiak's wins on the left · Tom Okker's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (10)
| 1980 | Cincinnati | Hard | R64 | Jeff Borowiak | 7-5 6-2 |
| 1977 | Philadelphia WCT | Carpet | R64 | Jeff Borowiak | 6-3 3-6 6-3 |
| 1975 | Nottingham | Grass | R16 | Tom Okker | 4-6 6-3 6-2 |
| 1973 | Chicago WCT | Carpet | R32 | Tom Okker | 6-2 5-7 6-1 |
| 1972 | Stockholm | Hard | R16 | Tom Okker | 7-6 6-2 |
| 1972 | Los Angeles-2 | Hard | R16 | Tom Okker | 6-3 6-4 |
| 1972 | Bretton Woods WCT | Clay | QF | Jeff Borowiak | 6-3 6-4 |
| 1972 | Quebec WCT | Carpet | R32 | Jeff Borowiak | 7-6 4-6 7-5 |
| 1972 | Toronto WCT | Carpet | R16 | Tom Okker | 6-3 6-4 |
| 1972 | Philadelphia WCT | Carpet | QF | Tom Okker | 7-5 6-3 |
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.