Head to head
2
Clay
1
Onny Parun's wins on the left · Zan Guerry's on the right · bar lengths share one scale
All meetings (3)
| 1977 | Buenos Aires-2 | Clay | R32 | Zan Guerry | 6-1 3-6 6-3 |
| 1972 | Indianapolis | Clay | R64 | Onny Parun | 4-6 7-6 6-4 |
| 1970 | Washington | Clay | R64 | Onny Parun | 4-6 6-1 7-5 |
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.