She made her Billie Jean King Cup debut for Japan in 2020, and also participated in the 2020 Olympic Games in Tokyo.

In 2016, she graduated from Palos Verdes Peninsula High School and attended UCLA before turning pro after her sophomore season.

[3] Shibahara made her Grand Slam main-draw debut at the US Open in the girls' doubles draw, partnering with Jada Hart as a wildcard.

Shibahara played her first five doubles tournaments of the year with Hayley Carter winning two titles and reaching another final.

[2] Partnering Aoyama, Shibahara won her maiden WTA 1000 title at the 2021 Miami Open and participated in the Tennis at the 2020 Summer Olympics in Japan.

Also in 2021 Shibahara made her WTA Tour-level main draw debut in singles in Cleveland as a lucky loser but lost to Bethanie Mattek-Sands.

[8] She became the first Japanese player in 25 years to win the mixed doubles championship in Paris, since Rika Hiraki and Mahesh Bhupathi took home the title in 1997.

[24] Shibahara and Siegemund ended runners-up at the Pan Pacific Open, losing to Shuko Aoyama and Eri Hozumi in the final.

[25] At the 2025 ATX Open Shibahara qualified for the main draw and reached her first WTA quarterfinal defeating Kaja Juvan and again Kimberly Birrell.

[26][27] Only main-draw results in WTA Tour, Grand Slam tournaments, Billie Jean King Cup and Olympic Games are included in win–loss records and career statistics.