[3] Kato won her major title in the mixed doubles at the 2023 French Open, together with her German partner Tim Pütz.

27 on 23 October 2023, the week she was selected to participate in the 2023 WTA Elite Trophy with Aldila Sutjiadi.

She had to forfeit her points and prize money, although she made clear she would appeal the supervisor's decision.

[7] Kato and Sutjiadi won the doubles title at the Thailand Open, defeating Guo Hanyu and Jiang Xinyu in the final.

[9] Only main-draw results in WTA Tour, Grand Slam tournaments, Fed Cup/Billie Jean King Cup and Olympic Games are included in win–loss records and career statistics.