The 27-year-old Austrian has not played since his Dubai opening-round defeat.
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2017 |
China Open
|
1/16 | John Isner |
2-6
3-6 |
| 2017 |
ASB Classic
|
1/8 | John Isner |
3-6
6-3 6-7 |
| 2015 |
US Open
|
1/64 | John Isner |
6-2
6-3 6-4 |
| 2012 |
Summer Olympics
|
1/16 | John Isner |
7-6
6-2 |
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2021 |
Sardegna Open, Qualification
|
1/8 | Jozef Kovalik |
6-3
6-1 |
| 2021 |
Dubai Tennis Championships
|
1/16 | Dusan Lajovic |
5-7
2-6 |
| 2021 |
Dubai Tennis Championships
|
1/32 | Malek Jaziri |
3-3
|
| 2021 |
Qatar Open
|
1/8 | Nikoloz Basilashvili |
2-6
2-6 |
| 2021 |
Qatar Open
|
1/16 | Malek Jaziri |
2-6
5-7 |
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2021 |
Miami Open
|
1/8 | Roberto Bautista Agut |
3-6
6-4 6-7 |
| 2021 |
Miami Open
|
1/16 | John Isner |
6-7
6-7 |
| 2021 |
Miami Open
|
1/32 | John Isner |
6-2
3-6 5-7 |
| 2021 |
Mexican Open
|
1/8 | Stefanos Tsitsipas |
6-3
6-2 |
| 2021 |
Mexican Open
|
1/16 | John Isner |
6-4
6-3 |
| 2021 |
Delray Beach Open
|
Quarter Finals | Sebastian Korda |
6-3
4-6 6-3 |
| 2021 |
Delray Beach Open
|
1/8 | John Isner |
4-6
6-7 |
