Stadium: Court 5 Round: 25 Ground: Clay
| WTA Miami WD | 2021/03/26 23:25 | Babos/Kudermetova v Perez/Zheng | 3-6,6-4,10-7 |
| WTA Stuttgart WD | 2021/04/19 13:00 | Barty/Brady v Christian K / Santamaria S | 6-3,6-1 |
| WTA Charleston WD | 2021/04/13 21:05 | 구물리아 B / 롬피에스 J v Christian K / Santamaria S | 7-6,3-6,12-10 |
| WTA St. Petersburg WD | 2021/03/21 10:30 | Kichenok N / Olaru R v Christian K / Santamaria S | 2-6,6-3,10-8 |
| WTA St. Petersburg WD | 2021/03/20 15:15 | Kalashnikova O / Kudryavtseva A v Christian K / Santamaria S | 7-5,4-6,4-10 |
| WTA St. Petersburg WD | 2021/03/18 12:20 | Vesnina/Zvonareva v Christian K / Santamaria S | 7-5,3-6,9-11 |
| WTA St. Petersburg WD | 2021/03/17 11:15 | Gorgodze/Rakhimova v Christian K / Santamaria S | 6-4,5-7,7-10 |
| WTA Dubai WD | 2021/03/07 12:30 | Bertens/Kerkhove v Christian K / Santamaria S | 6-4,5-7,10-5 |
| WTA Lyon WD | 2021/03/03 12:55 | Bouchard/Danilovic v Christian K / Santamaria S | 6-3,6-4 |