Head to head
0
Hard
1
0
Clay
1
1
Grass
4
John Marks's wins on the left · Phil Dent's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (7)
| 1979 | Australian Open | Grass | R64 | Phil Dent | 6-3 6-2 6-2 |
| 1979 | Sydney-2 | Grass | R32 | Phil Dent | 6-2 6-3 |
| 1979 | Hobart | Hard | R32 | Phil Dent | 6-4 4-6 6-1 |
| 1978 | Australian Open | Grass | R32 | John Marks | 6-7 6-3 6-2 6-2 |
| 1978 | Brisbane | Grass | R32 | Phil Dent | 7-6 6-3 |
| 1977 | Louisville | Clay | R64 | Phil Dent | 6-1 6-3 |
| 1973 | Sydney-1 | Grass | R32 | Phil Dent | 7-5 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.