Career
Sawamatsu reached a career high ranking of World Number. 14 on 6 February 1995. Sawamatsu"s most significant title came in 1993 at Strasbourg, she defeated clay courter Judith Wiesner in the final.
Sawamatsu had much success at Strasbourg reaching the semifinals in 1991, final in 1992 losing to Judith Wiesner.
Sawamatsu retired from professional tennis after losing in the second round of the 1998 Japan Open to Monica Seles in a three set match 6–3, 3–6, 6–3. Sawamatsu had wins over the following players during her career Martina Hingis, Lindsay Davenport, Kimiko Date, Mary Joe Fernandez, Amanda Coetzer, and Conchita Martínez.
She was the first player to be beaten by Venus Williams in the main draw of a Grand Slam tournament, at the French Open in 1997. Since retirement, Sawamatsu has been involved in the development of the sport in her native country.
Singles 7 (4-3).