Head to head
1
Hard
0
1
Clay
0
0
Grass
1
1
Carpet
0
Billy Martin's wins on the left · Paul Kronk's on the right · bar lengths share one scale
All meetings (4)
| 1981 | Wimbledon | Grass | R128 | Paul Kronk | 6-2 6-3 3-6 6-3 |
| 1976 | Washington-2 | Clay | R64 | Billy Martin | 6-3 6-2 |
| 1974 | Tempe | Hard | R32 | Billy Martin | 6-1 7-5 |
| 1974 | Salisbury | Carpet | R64 | Billy Martin | 5-7 7-6 RET |
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.