Twenty-one of 25 former champions were, had been, or would be ranked in the Top 20.
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2019 |
Citi Open
|
1/16 | Milos Raonic |
6-1
6-4 |
| 2019 |
Citi Open
|
1/32 | Tim Smyczek |
4-6
4-6 |
| 2019 |
Citi Open, Qualification
|
1/6 (Special Qual) | Tim Smyczek |
6-7
7-5 3-6 |
| 2019 |
Citi Open, Qualification
|
1/12 (Special Qual) | Tim Smyczek |
6-4
6-2 |
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2006 |
Generali Ladies Linz
Austria, Linz |
Championship | Vera Zvonareva |
6-4
6-6 |
| 2006 |
Zurich Open
Switzerland, Zurich |
Championship | Katarina Srebotnik |
6-3
7-5 |
| 2006 |
Porsche Tennis Grand Prix
Germany, Stuttgart |
Championship | Jelena Jankovic |
7-6
6-3 |
