Twenty-one of 25 former champions were, had been, or would be ranked in the Top 20.
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2015 |
BNP Paribas WTA Finals Singapore Red Group
|
Championship | Maria Sharapova |
7-5
6-1 |
| 2015 |
BNP Paribas WTA Finals Singapore Red Group
|
Championship | Flavia Pennetta |
6-7
4-6 |
| 2015 |
BNP Paribas WTA Finals Singapore Red Group
|
Championship | Simona Halep |
6-0
6-3 |
| 2015 |
Kremlin Cup By Bank Of Moscow
|
Quarter Finals | Lesia Tsurenko | |
| 2015 |
Kremlin Cup By Bank Of Moscow
|
1/8 | Flavia Pennetta |
6-2
6-4 |
| 2015 |
Tianjin Open
|
1/16 | Lyudmyla Kichenok |
3-6
5-7 |
| year | Event | RND | Winner | Results |
|---|---|---|---|---|
| 2020 |
US Open WTA
|
1/64 | Alison Riske |
3-6
2-6 |
| 2020 |
Monterrey Open
|
1/8 | Johanna Konta |
6-7
3-6 |
| 2020 |
Monterrey Open
|
1/16 | Tatjana Maria |
6-7
6-3 5-7 |
| 2020 |
Mexican Open
|
1/8 | Anastasia Potapova |
3-6
3-6 |
| 2020 |
Mexican Open
|
1/16 | Tatjana Maria |
4-6
6-1 2-6 |
