On 15 September 2014, she reached her best singles ranking of world number 169. On 25 August 2014, she peaked at world number 146 in the doubles rankings. Kuwata made her Women's Tennis Association tour debut at the 2014 Citi Open, having entered the qualifying tournament and defeating Sanaz Marand and Stéphanie Dubois for a spot in the main draw.
She was thereby pitted against world number 45 Alison Riske and defeated the American in straight sets, losing five games in the process.
She also competed in the doubles event, partnering with Kurumi Nara to defeat Nicola Slater and Emily Webley-Smith in the first round. The Japanese advanced to the final of the event, losing to Shuko Aoyama and Gabriela Dabrowski.