The German praised how well-organized his new coach and fellow former No. 3 is.
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2019 |
Madrid Open
|
1/16 | Alexander Zverev |
4-6
1-6 |
| 2019 |
Madrid Open
|
1/32 | David Ferrer |
6-4
4-6 6-4 |
| 2019 |
Barcelona Open
|
1/8 | Rafael Nadal |
6-3
6-3 |
| 2019 |
Barcelona Open
|
1/16 | David Ferrer |
6-3
6-1 |
| 2019 |
Barcelona Open
|
1/32 | David Ferrer |
6-3
6-1 |
| 2019 |
Miami Open
|
1/16 | Frances Tiafoe |
5-7
6-3 6-3 |
| 2019 |
Miami Open
|
1/32 | David Ferrer |
2-6
7-5 6-3 |
| 2019 |
Miami Open
|
1/64 | David Ferrer |
3-6
2-6 |
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2018 |
Korea Open Tennis
|
1/8 | Irina-Camelia Begu |
6-4
6-3 |
| 2018 |
Korea Open Tennis
|
1/16 | Agnieszka Radwanska |
4-6
5-7 |
| 2018 |
US Open WTA
|
1/64 | Tatjana Maria |
3-6
3-6 |
| 2018 |
Connecticut Open
|
1/16 | Petra Kvitova |
1-6
6-7 |
