[2] In May, Uchijima won three consecutive titles on the ITF Circuit, reaching a career-high of 80 in the world rankings[2] and making her the Japanese No.

2 seed, Aryna Sabalenka, in straight sets, ending a run of 19 consecutive professional match wins for Uchijima.

[5] She qualified for the Canadian Open and recorded her first WTA 1000 win, over Viktoriya Tomova,[6] before losing to sixth seed Liudmila Samsonova.

[12] Partnering Guo Hanyu, she won her maiden WTA Tour doubles title at the Jiangxi Open, defeating Katarzyna Piter and Fanny Stollár in the final.

63, Uchijima defeated Magda Linette to reach the second round at the Australian Open,[14] where she lost to 14th seed Mirra Andreeva in a match which went to a deciding set tiebreak.