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 |
|---|---|---|---|---|
| 2020 |
Roland Garros WTA
|
1/64 | Kaia Kanepi |
6-4
4-6 2-6 |
| 2020 |
US Open WTA
|
1/32 | Ons Jabeur |
7-6
6-0 |
| 2020 |
US Open WTA
|
1/64 | Kaia Kanepi |
1-6
2-6 |
| 2020 |
Australian Open WTA
|
1/64 | Barbora Krejcikova |
6-7
6-2 3-6 |
