Indian Wells, California USA, 06.10. – 17.10.2021 / WTA1000
Chigago USA, 27.09. – 03.10.2021 / WTA500
Fort Worth, Texas USA, 20.09. – 26.09.2021 / ITF
Kaia won her 20th singles title on ITF Tour.
Fort Worth, Texas USA, 20.09. – 26.09.2021 / ITF
Fort Worth, Texas USA, 20.09. – 26.09.2021 / ITF
Fort Worth, Texas USA, 20.09. – 26.09.2021 / ITF
Fort Worth, Texas USA, 20.09. – 26.09.2021 / ITF
New York USA, 29.08. – 11.09.2021 / GS
New York USA, 29.08. – 11.09.2021 / GS
Chigago USA, 22.08. – 28.08.2021 / WTA250
Chigago USA, 22.08. – 28.08.2021 / WTA250
Pärnu EST, 02.08. – 08.08.2021 / ITF
Kaia won her 19th ITF level tournament,
Pärnu EST, 02.08. – 08.08.2021 / ITF
Pärnu EST, 02.08. – 08.08.2021 / ITF
Pärnu EST, 02.08. – 08.08.2021 / ITF
Pärnu EST, 02.08. – 08.08.2021 / ITF
London UK, 28.06. – 11.07.2021 / GS
Kaia continues Wimbledon in doubles. She is teamed up with Shuai Zhang (CHN) and they play 1st Harriet Dart and Heather Watson (both GBR).
01.07.2021 Kaia and Shuai lost their doubles match 3:6 2:6
Paris FRA, 30.05. – 12.06.2021 / GS
Parma ITA, 19.05. – 26.05.2021 / WTA250
Madrid ESP, 27.04. – 08.05.2021 / WTA1000
Kaia failed to qualify