In the ITTF Portugal Open 2019, she caused a major upset by beating 4-time Women's World Cup Champion Liu Shiwen 4–3.

[8] In January 2020, she won the All Japan Table Tennis Championships for the first time, shocking reigning champion Mima Ito in the semi-finals and then defeating Kasumi Ishikawa in the finals.

Together with Mima Ito, Hayata won silver medals in women's doubles after beating Qian Tianyi/Chen Meng 3:2 in the semi-finals and losing to Sun Yingsha/Wang Manyu 3:0 in the finals.

In women's singles Hayata reached the semi-finals after winning a thrilling quarterfinal encounter with 4:3 against Wang Yidi, in which she saved nine match points and won game seven by 21:19.

In August, Hayata participated at the WTT Contender Rio de Janeiro, where she won the women's single title by beating Linda Bergstrom of Sweden in the finals by 4:1.

At the 2022 Asian Games held in September 2023 in Hangzhou, Hayata led the japanese women team to win the silver medal.

On 13 August 2024, in an interview upon her return to Japan from the 2024 Summer Olympics, Hayata expressed her desire to visit the Chiran Peace Museum for Kamikaze Pilots.

[16][17] The day after her comments, Sun Yingsha and Chinese table tennis player Fan Zhendong unfollowed Hayata on the Chinese social media platform Weibo, while the official Weibo account of the People's Liberation Army posted a message stating that "promoting this so-called 'Peace Hall' will do no good to Japan's future" and "we must be vigilant against the lingering ghost of militarism and prevent the tragedy of history from repeating itself.