She plays predominantly in doubles and has won 20 titles on the WTA Tour,[2] having had her most successful Grand Slam appearances at the 2023 Australian Open final and at Wimbledon, reaching the semifinals at the 2013[3] and 2021 tournaments.

Soon after, she won her first Grand Slam match at the Australian Open, but then lost in the second round playing with Irina Falconi.

At the end of the year, she reached semifinals of the Korea Open and won the Toyota World Challenge.

In 2014, in singles, her only significant result came at the end of the year, when she reached the final of the Toyota World Challenge but lost to An-Sophie Mestach.

In the first week of the 2015 season, she reached the final at the Auckland Open with Renata Voráčová, they lost to Sara Errani and Roberta Vinci.

She then did not have significant results until September, before she reached semifinals at the Korea Open, and later winning two $100k events, in Nanjing and Tokyo.

[citation needed] For the three other majors during the year Aoyama partnered with Chan Hao-ching, reaching the quarterfinal stage at Wimbledon, and the third round at the US Open (losing to the eventual winners Krejčíková and Siniaková).

[citation needed] Her final competition was at the Billie Jean King Cup where Aoyama partnered with Shibahara once again.

[citation needed] At the Australian Open, she reached the finals of a major for the fourth time in her career, again with Shibahara.

[citation needed] Partnering with Eri Hozumi, Aoyama won the doubles title at the Pan Pacific Open, defeating Ena Shibahara and Laura Siegemund in the final.

[11] The pair were runners-up at the Hong Kong Open, losing to Ulrikke Eikeri and Makoto Ninomiya in the final which went to a deciding champions tiebreak.

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