By surface
| Surface | John Isner | Mackenzie Mcdonald |
|---|---|---|
| Hard | 1 | 0 |
All meetings (1)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2021-03-22 | ATP | Miami Masters | Round of 64 | Hard | John Isner | 2-6 | 6-3 | 7-5 |
| Surface | John Isner | Mackenzie Mcdonald |
|---|---|---|
| Hard | 1 | 0 |
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2021-03-22 | ATP | Miami Masters | Round of 64 | Hard | John Isner | 2-6 | 6-3 | 7-5 |