Twenty-one of 25 former champions were, had been, or would be ranked in the Top 20.
| 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 |
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2018 |
St. Petersburg Open
|
1/8 | Roberto Bautista Agut |
6-7
6-3 3-6 |
| 2018 |
St. Petersburg Open
|
1/16 | Mikhail Youzhny |
6-7
4-6 |
| 2018 |
US Open ATP
|
1/64 | Marcos Baghdatis |
6-4
6-4 2-6 3-1 |
| 2018 |
Rogers Cup
|
1/16 | Robin Haase |
5-7
2-6 |
