Head to head
0
Clay
1
0
Carpet
1
Robert McKinley's wins on the left · Cliff Richey's on the right · bar lengths share one scale
All meetings (2)
| 1973 | Seattle | Carpet | R16 | Cliff Richey | 6-0 6-4 |
| 1970 | Washington | Clay | R64 | Cliff Richey | 6-1 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.