Head to head
1
Hard
1
0
Clay
1
0
Carpet
2
Jim McManus's wins on the left · Tom Okker's on the right · bar lengths share one scale
All meetings (5)
| 1974 | Las Vegas | Hard | R32 | Tom Okker | 7-6 6-4 |
| 1974 | Miami WCT | Carpet | R16 | Tom Okker | 6-2 6-1 |
| 1973 | Washington-3 | Clay | R32 | Tom Okker | 6-1 6-1 |
| 1968 | New York-1 | Carpet | R32 | Tom Okker | 6-4 13-11 |
| 1968 | Salisbury | Hard | R32 | Jim McManus | 6-3 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.