The German switched coaches three times in 2019.
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2020 |
Adria Tour, Group B
|
Championship | Nikola Milojevic |
3-4
0-0 |
| 2020 |
Adria Tour, Group B
|
Championship | Dominic Thiem |
1-4
4-1 4-3 |
| 2020 |
Adria Tour, Group B
|
Championship | Grigor Dimitrov |
4-3
3-4 4-1 |
| 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 |
