![United States' Serena Williams makes a backhand return to Bulgaria's Tsvetana Pironkova during a tuneup event ahead of the Australian Open tennis championships in Melbourne, Australia, Wednesday, Feb. 3, 2021. (AP Photo/Andy United States' Serena Williams makes a backhand return to Bulgaria's Tsvetana Pironkova during a tuneup event ahead of the Australian Open tennis championships in Melbourne, Australia, Wednesday, Feb. 3, 2021. (AP Photo/Andy](https://c8.alamy.com/comp/2MF7F0B/united-states-serena-williams-makes-a-backhand-return-to-bulgarias-tsvetana-pironkova-during-a-tuneup-event-ahead-of-the-australian-open-tennis-championships-in-melbourne-australia-wednesday-feb-3-2021-ap-photoandy-brownbill-2MF7F0B.jpg)
United States' Serena Williams makes a backhand return to Bulgaria's Tsvetana Pironkova during a tuneup event ahead of the Australian Open tennis championships in Melbourne, Australia, Wednesday, Feb. 3, 2021. (AP Photo/Andy
![Getting to Know: Tsvetana Pironkova - Official Site of the 2022 US Open Tennis Championships - A USTA Event Getting to Know: Tsvetana Pironkova - Official Site of the 2022 US Open Tennis Championships - A USTA Event](https://photo-assets.usopen.org/images/pics/large/f_20200903_USO_CM3_3539.jpg)
Getting to Know: Tsvetana Pironkova - Official Site of the 2022 US Open Tennis Championships - A USTA Event
![Serena Williams edges out Tsvetana Pironkova to reach US Open semi-finals against Victoria Azarenka | Tennis News | Sky Sports Serena Williams edges out Tsvetana Pironkova to reach US Open semi-finals against Victoria Azarenka | Tennis News | Sky Sports](https://e0.365dm.com/20/09/768x432/skysports-serena-williams-tennis_5091511.jpg?20200909182201)
Serena Williams edges out Tsvetana Pironkova to reach US Open semi-finals against Victoria Azarenka | Tennis News | Sky Sports
![Tsvetana Pironkova ousts Donna Vekic for US Open Round-of-16 berth - Official Site of the 2022 US Open Tennis Championships - A USTA Event Tsvetana Pironkova ousts Donna Vekic for US Open Round-of-16 berth - Official Site of the 2022 US Open Tennis Championships - A USTA Event](https://photo-assets.usopen.org/images/pics/large/f_20200905_USO_P5S_3130.jpg)