By surface
| Surface | Jack Adolphson | John Penero |
|---|---|---|
| Hard | 1 | 0 |
All meetings (1)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1968-05-29 | ATP | Sacramento | Round of 64 | Hard | Jack Adolphson | 8-6 | 6-0 |
| Surface | Jack Adolphson | John Penero |
|---|---|---|
| Hard | 1 | 0 |
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1968-05-29 | ATP | Sacramento | Round of 64 | Hard | Jack Adolphson | 8-6 | 6-0 |