The German switched coaches three times in 2019.
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2020 |
Nur-Sultan
|
1/16 | Aslan Karatsev |
7-6
6-1 |
| 2020 |
Davis Cup Qualifying Round
|
Championship | Alexander Bublik |
7-6
6-1 |
| 2020 |
Davis Cup Qualifying Round
|
Championship | Robin Haase |
4-6
7-6 3-6 |
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2020 |
Qatar Total Open
|
1/32 | Maria Sakkari |
6-4
6-3 |
| 2020 |
Dubai Duty Free Tennis Championships, Qualification
|
1/12 (Special Qual) | Sorana Cirstea |
7-5
4-6 6-7 |
| 2020 |
Dubai Duty Free Tennis Championships, Qualification
|
1/24 (Special Qual) | Julia Goerges |
6-2
6-4 |
