Head to head
0
Hard
2
6
Clay
0
1
Carpet
0
Guillermo Vilas's wins on the left · Gene Mayer's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (9)
| 1984 | US Open | Hard | R32 | Gene Mayer | 6-3 6-1 6-4 |
| 1984 | Hamburg | Clay | QF | Guillermo Vilas | 6-3 6-2 |
| 1983 | Rotterdam | Hard | F | Gene Mayer | 6-1 7-6 |
| 1983 | Davis Cup WG R1: ARG vs USA | Clay | RR | Guillermo Vilas | 6-3 6-3 6-4 |
| 1979 | Roland Garros | Clay | R16 | Guillermo Vilas | 7-5 1-6 6-7 6-1 6-2 |
| 1979 | Rome | Clay | SF | Guillermo Vilas | 6-3 3-0 RET |
| 1977 | Santiago | Clay | QF | Guillermo Vilas | 6-4 6-4 |
| 1977 | US Open | Clay | R64 | Guillermo Vilas | 6-3 6-0 |
| 1977 | Springfield | Carpet | SF | Guillermo Vilas | 7-6 7-6 6-1 |
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.