Head to head
1
Hard
1
2
Clay
0
1
Grass
0
1
Carpet
0
Cliff Richey's wins on the left · Onny Parun's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (6)
| 1978 | Johannesburg-2 | Hard | R32 | Onny Parun | 6-3 7-5 |
| 1976 | North Conway | Clay | R64 | Cliff Richey | 6-2 6-1 |
| 1971 | Houston | Clay | R16 | Cliff Richey | 6-1 6-4 |
| 1971 | San Juan | Hard | R16 | Cliff Richey | 6-4 7-6 |
| 1971 | Salisbury | Carpet | R32 | Cliff Richey | 6-2 6-1 |
| 1969 | Haverford | Grass | SF | Cliff Richey | 6-4 13-15 6-4 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.