Head to head
1
Clay
1
1
Grass
0
John Cooper's wins on the left · Toshiro Sakai's on the right · bar lengths share one scale
All meetings (3)
| 1972 | US Open | Grass | R64 | John Cooper | 6-3 6-3 6-2 |
| 1972 | Hilversum | Clay | R64 | John Cooper | 6-1 6-2 |
| 1971 | Davis Cup AME F: JPN vs AUS | Clay | RR | Toshiro Sakai | 6-1 15-13 8-6 |
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.