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 |
Monterrey
|
1/16 | Bernard Tomic |
6-3
6-7 6-3 |
| 2020 |
Delray Beach Open
|
1/16 | Cedrik-Marcel Stebe |
6-2
3-6 6-2 |
| 2020 |
Delray Beach Open, Qualification
|
Quarter Finals | Ernests Gulbis |
2-6
0-6 |
