Head to head
1
Hard
0
2
Clay
1
Mark Cox's wins on the left · Ron Holmberg's on the right · bar lengths share one scale
All meetings (4)
| 1971 | Toronto WCT | Clay | R64 | Mark Cox | 6-1 7-6 |
| 1969 | Charlotte | Clay | QF | Mark Cox | 6-3 6-1 |
| 1968 | Charlotte | Clay | SF | Ron Holmberg | 6-4 6-8 7-5 |
| 1968 | Salisbury | Hard | R32 | Mark Cox | 11-9 1-6 6-2 |
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.