Head to head
2
Hard
1
0
Grass
1
Billy Martin's wins on the left · Kim Warwick's on the right · bar lengths share one scale
All meetings (4)
| 1980 | Queen's Club | Grass | R32 | Kim Warwick | 6-1 4-6 6-1 |
| 1977 | Carlsbad | Hard | R64 | Billy Martin | 6-2 6-2 |
| 1976 | Sydney-1 | Hard | R64 | Kim Warwick | 6-0 6-3 |
| 1975 | Maui | Hard | R16 | Billy Martin | 6-0 6-3 |
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.