Head to head
5
Hard
0
2
Clay
1
5
Grass
0
2
Carpet
1
Stan Smith'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 (16)
| 1977 | Wimbledon | Grass | R32 | Stan Smith | 6-3 5-7 9-8 7-5 |
| 1975 | US Open | Clay | R128 | Onny Parun | 6-4 6-2 |
| 1973 | Alamo | Hard | R16 | Stan Smith | 7-6 4-6 6-4 |
| 1973 | US Open | Grass | QF | Stan Smith | 6-3 6-3 6-2 |
| 1973 | Atlanta WCT | Carpet | QF | Stan Smith | 6-4 3-6 6-3 |
| 1973 | Carlsbad WCT | Hard | R32 | Stan Smith | 6-1 6-2 |
| 1972 | London-3 | Carpet | R16 | Onny Parun | 6-4 6-3 |
| 1971 | Los Angeles | Hard | R32 | Stan Smith | 6-4 6-4 |
| 1971 | Wimbledon | Grass | QF | Stan Smith | 8-6 6-3 6-4 |
| 1971 | Queen's Club | Grass | R64 | Stan Smith | 6-1 6-4 |
| 1970 | Cincinnati | Clay | R32 | Stan Smith | 6-2 6-2 |
| 1970 | Hampton | Carpet | R32 | Stan Smith | 8-6 11-9 |
| 1969 | Berkeley | Hard | R16 | Stan Smith | 6-4 6-3 |
| 1969 | Boston-2 | Grass | R16 | Stan Smith | 6-4 6-3 |
| 1969 | Indianapolis | Clay | R32 | Stan Smith | 6-1 7-5 |
| 1969 | San Juan | Hard | R64 | Stan Smith | 6-3 9-11 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.