Head to head
Rivalry summary
Ross Case and Onny Parun met 5 times on the ATP tour between 1971 and 1974. Onny Parun leads the head-to-head 4–1 against Ross Case. By surface, Parun leads 2–1 on hard; Parun leads 2–0 on grass.
1
Hard
2
0
Grass
2
Ross Case's wins on the left · Onny Parun's on the right · bar lengths share one scale
All meetings (5)
| 1974 | Jakarta | Hard | QF | Onny Parun | 7-5 6-4 |
| 1974 | Sydney-2 | Hard | R16 | Onny Parun | 6-2 7-6 |
| 1974 | Auckland | Grass | SF | Onny Parun | 7-5 6-3 6-1 |
| 1973 | US Open | Grass | R16 | Onny Parun | 6-4 6-1 4-6 6-4 |
| 1971 | Berkeley WCT | Hard | R64 | Ross Case | 3-6 6-3 7-6 |
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.