[5] Miyazaki made her WTA Tour main-draw debut at the 2021 Transylvania Open, partnering Anastasia Gasanova in the doubles tournament.

[7][8] In October 2022, Miyazaki won her first $60k title in Glasgow beating former top 40 player, compatriot Heather Watson, in the final, coming back from a set and a double break down.

[10] In the first round of the main draw, she drew former top-50 player Margarita Betova, who had entered on a protected ranking following injuries and a maternity break.

She subsequently lost in the second round to 15th seed Belinda Bencic winning three games in each set,[11] and rose to a career-high ranking of No.

[12] Given a wildcard entry into the main draw at Wimbledon, Miyazaki won her first-round match against Tamara Korpatsch 6–2, 6–1,[13][14] before being double-bagelled by 12th seed Daria Kasatkina in round two.