She became a professional tennis player in 1981 and won at the age of 14 years 6 months and 24 days her first professional tennis tournament in Kyoto. This makes it the second- youngest player in tennis history after Tracy Austin, who succeeded as a success.
During her career she reached the semi-finals of all the Grand Slam tournaments and could players like Steffi Graf, Jana Novotna and Pam Shriver beat. The big breakthrough, however they never made it. Overall, you get three tournament victories in singles and two hits in doubles.
In September 1997, Kathy Rinaldi ended her career as a tennis player.