Head to head
1
Clay
2
2
Grass
0
Allan Stone's wins on the left · Antonio Munoz's on the right · bar lengths share one scale
All meetings (5)
| 1973 | Rome | Clay | R128 | Antonio Munoz | 7-5 4-6 6-2 |
| 1972 | US Open | Grass | R64 | Allan Stone | 6-1 6-0 6-7 6-0 |
| 1971 | Hamburg | Clay | R32 | Allan Stone | 6-0 2-6 4-6 6-1 6-4 |
| 1968 | Adelaide | Grass | R64 | Allan Stone | 6-4 6-3 6-3 |
| 1968 | Barcelona | Clay | R32 | Antonio Munoz | 7-9 4-6 7-5 6-4 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.