Johnson and Sock survived five-set marathon matches on day one.
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2020 |
Prostejov
|
1/8 | Jozef Kovalik |
6-1
2-6 6-2 |
| 2020 |
Prostejov
|
1/16 | Cedrik-Marcel Stebe |
5-7
6-2 6-2 |
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2020 |
US Open ATP
|
1/32 | Adrian Mannarino |
7-6
7-5 6-2 |
| 2020 |
US Open ATP
|
1/64 | Jack Sock |
3-6
6-4 6-2 4-6 7-6 |
