Head to head
2
Clay
0
1
Grass
1
Allan Stone's wins on the left · Terry Ryan's on the right · bar lengths share one scale
All meetings (4)
| 1973 | Tehran | Clay | R32 | Allan Stone | 6-1 6-3 |
| 1973 | Haverford | Grass | R32 | Terry Ryan | 7-6 3-6 7-6 |
| 1969 | Southampton | Grass | QF | Allan Stone | 6-4 6-3 |
| 1969 | Cincinnati | Clay | R64 | Allan Stone | 7-5 7-9 6-2 |
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.