Head to head
0
Clay
1
4
Grass
4
John Alexander'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 (9)
| 1979 | Davis Cup EUR F: NZL vs AUS | Grass | RR | Onny Parun | 7-5 6-3 6-3 |
| 1977 | Davis Cup EUR F: NZL vs AUS | Grass | RR | John Alexander | 9-11 4-6 6-4 6-3 6-4 |
| 1976 | Wimbledon | Grass | R128 | Onny Parun | 2-6 9-8 9-7 1-6 8-6 |
| 1975 | Roland Garros | Clay | R16 | Onny Parun | 6-2 2-6 3-6 6-3 8-6 |
| 1971 | Auckland | Grass | SF | John Alexander | 7-5 5-7 4-6 7-6 7-6 |
| 1970 | Auckland | Grass | R16 | John Alexander | 3-6 6-4 6-3 6-4 |
| 1969 | Haverford | Grass | R32 | Onny Parun | 19-21 6-4 6-2 |
| 1969 | Wimbledon | Grass | R64 | John Alexander | 7-5 6-4 6-3 |
| 1968 | Adelaide | Grass | R16 | Onny Parun | 3-6 6-4 6-3 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.