The 27-year-old Austrian has not played since his Dubai opening-round defeat.
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2012 |
Wimbledon
|
1/64 | Alejandro Falla |
4-6
7-6 6-3 6-7 5-7 |
| 2009 |
BNP Paribas Masters
France, Paris |
Championship | John Isner |
6-4
6-7 5-7 |
| 2008 |
Tennis Channel Open
United States, Nevada, Las Vegas |
Championship | John Isner |
6-4
3-6 4-6 |
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2017 |
Monterrey
|
1/16 | Cristian Garin |
6-7
3-6 |
| 2017 |
Bogota
|
1/16 | Victor Estrella Burgos |
6-2
6-4 |
| 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 |
