Head to head
0
Hard
1
1
Carpet
1
Onny Parun's wins on the left · Billy Martin's on the right · bar lengths share one scale
All meetings (3)
| 1977 | Los Angeles-2 | Hard | R32 | Billy Martin | 7-5 6-3 |
| 1976 | St. Louis WCT | Carpet | R16 | Billy Martin | 6-1 7-5 |
| 1974 | Denver WCT | Carpet | R32 | Onny Parun | 7-5 4-6 7-6(5) |
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.