Akane Yamaguchi

2010–2012

Yamaguchi topped Japan's National Junior Championship in 2010. Her first entry into professional competition took place at Osaka International Challenge in 2012. In July 2012, she represented Japan at the Asian Junior Championships in Gimcheon, South Korea. She reached the semi-finals in the women's singles event and won the bronze medal, losing to Nozomi Okuhara with a score of 19–21 and 9–21. She was also inducted into Japan's national junior team that won Japan's first junior mixed team title. Yamaguchi reached the finals of the World Junior Championships in the singles event, coming second when she lost to Okuhara again.

2013

In April 2013, Yamaguchi finished second to Kaori Imabeppu at the Osaka International in the women's singles event with a score of 20–22, 16–21. She was the women's singles runner-up in the New Zealand Open, a Grand Prix tournament. She participated in the Japan Open, unseeded. She defeated P. V. Sindhu, the bronze medalist from the 2013 world championships in two straight games in round sixteen. She also defeated seeded player Tai Tzu-ying in a semi-final, leading to her match-up with her compatriot Shizuka Uchida, whom she beat in the final to become the youngest player to win the BWF Super Series tournament, aged only 16. This was also Japan's first ever victory at the home event since 1981.

One year after losing the final at the world juniors competition, Yamaguchi won the title by beating her teammate Aya Ohori. While in high school, Yamaguchi won the national badminton competition, competing in the women's singles event. At the 2nd Asian Youth Games held in Nanjing, China in August 2013, where she represented Fukushima Prefectural Tomioka High School, she won the gold medal in mixed doubles. In October, she represented Japan at the East Asian Games held in Tianjin, China, where she finished third in the women's singles event, losing in three sets to Wang Shixian. After graduating from high school, she joined the Saishunkan Pharmaceutical badminton team.

Yamaguchi was named the Most Promising Player of the Year by the Badminton World Federation in late 2013 and 2014.

2014

At the Malaysian Open in January, Yamaguchi defeated reigning world champion Ratchanok Intanon in the first round in three games. In February, still a teenager, Yamaguchi entered the 2014 Asian Junior Championships as the fourth seed. She won the title by defeating Chen Yufei from China. She competed at the All England Open in March. She defended her World Junior crown, winning against Chinese player He Bingjiao in the final round.

She was part of the Japanese team that won the silver medal at the 2014 Uber Cup. On 16 August, Yamaguchi served as the flag-bearer for the Japanese team at the opening ceremony of the 2014 Summer Youth Olympics in Nanjing, China. She was the number one seed in the women's singles event, eventually winning the silver medal.

At the China Open in November, Yamaguchi defeated top ranked players in two straight games, Wang Shixian, Sun Yu, Bae Yeon-ju and reached the final. She finished as runner-up in the tournament after losing to Saina Nehwal. She then won the All Japan General Championships in December. At 17 years of age, she was the second-youngest player to win the tournament.

She qualified for participation in the end-of-year championships, the Super Series Finals tournament held in December. She won all of her group matches, against (former champion) Wang Yihan, Ratchanok Intanon and Tai Tzu-ying. She lost in the semi-final against Korean player Sung Ji-hyun.

2015–2016

In the second round of the Indonesian Open in June, Yamaguchi beat the reigning Olympic champion Li Xuerui. At the Japan Open, where she was the champion two years earlier, Yamaguchi was beaten in the final by Nozomi Okuhara. In October, she became champion of the Bitburger Open with a victory over Thailand's Busanan Ongbamrungphan.

In August 2016, Yamaguchi represented her country at the 2016 Summer Olympics held in Rio de Janeiro, Brazil. She was eliminated in the quarter finals by sixth seed Nozomi Okuhara. In October, Yamaguchi won her second Super Series title at the Korea Open, beating Sung Ji-hyun. She followed this with a win at the Denmark Open held at Odense. On her way to victory, Yamaguchi defeated her teammate Okuhara in the quarter-finals and two-time World Champion and Olympic gold medalist Carolina Marín in a close three-set match in the semi-finals. In the women's singles final, she defeated the No. 2 seed, Tai Tzu-ying, winning the tournament.

2017

In February 2017, Yamaguchi represented Japan at the Asia Mixed Team Championships held in Ho Chi Minh City, Vietnam, and helped the team win its first mixed team championship. In the same month, she won the title at the German Open via walkover against Carolina Marín. In April, she participated in the Asian Championships held in Wuhan, China, losing to Tai Tzu-ying in the final.

In August, Yamaguchi played in the World Championships in Glasgow. She was the no. 1 seed and had a bye in the first round. She defeated Denmark's Line Kjærsfeldt in the second round, but faced no. 9 seed Chen Yufei in the third round and was defeated 18–21, 19–21. She was a finalist at the Australian Super Series where she lost to Nozomi Okuhara. Afterwards she finished as a finalist in Denmark where she lost to Ratchanok Intanon. She was 19–16 up in the decider but her opponent reeled off five straight points and won.

In October, she played in the French Open and lost the final to the top seed, Tai Tzu-ying in a one-sided match. Her consistent run continued and she reached the final in the China Open. She defeated her Chinese rival Gao Fangjie by 21–13, 21–15 to win her first title of the year.

In December, she played in the Dubai World Super Series Finals, defeating Sayaka Sato and He Bingjiao and losing to India's P. V. Sindhu in the group stage. She won the semi-final, defeating Ratchanok Intanon. In the final, Yamaguchi defeated Sindhu, the World Championship runner-up, winning the women's singles championship in the Super Series Finals. Yamaguchi ended the year collecting US$261,363 from 15 tournaments, becoming the highest-paid player of the year.

2018

In March 2018, Yamaguchi played in the Super 300 German Open tournament. She won the title after defeating the No. 4 seed, China's Chen Yufei, in the final. She reached her first ever final at the All England Open where she was in the losing side to Tai Tzu-ying. In April, 20-year-old Yamaguchi ascended to the pinnacle of World rankings, dethroned Tai Tzu-ying as World No. 1 player and was awarded the "Honorary Citizen Award" by the mayor of Katsuyama, Japan, on 1 May 2018. In May, she was selected as the main female singles player for Japan in the Uber Cup, helping the Japanese team regain the women's team championship after 48 years, or 37 years if both genders are considered.

In July, she participated in the World Championships held in Nanjing, China. She was the second seed. In the top four, facing the Olympic runner-up P. V. Sindhu, she lost both games, finishing in third place in the World Championships women's singles.

In August, she represented Japan in the Asian Games held in Jakarta, Indonesia, and helped the Japanese women's team win the gold medal. In the women's singles semi-finals, facing the tournament's No. 3 seed Olympic runner-up P. V. Sindhu, Yamaguchi lost 1–2, winning the women's singles bronze medal. In a repeat clash of previous edition's French Open final, Yamaguchi beat the top seeded Tai Tzu-ying in three games, 22–20, 17–21, 21–13. In the process, she avenged her defeat to Tai at the same stage a year earlier.

2019

In February 2019, Yamaguchi played in the German Open. In the final, she defeated the No. 3 seed Ratchanok Intanon 2–1 to become the Super 300 women's singles champion. In April, she played in the Malaysia Open, finishing as the runner-up after losing to her arch rival Tai Tzu-ying, 0–2. She won the Asian Championships. In the semi-final, she defeated Chen Yufei, the top seed and made it through to the final where she defeated He Bingjiao, winning her first such title and becoming the first Japanese Women's singles player to do so.

In July, she won the Japan Open, her second Japan Open title since her first six years prior. That same month, she won a match against Taiwanese competitor Tai Tzu-ying, the highest-ranked player in the world, placing her in the finals of her first Indonesia Open. She outlasted P. V. Sindhu in the final round and bagged her first Super 1000 title. In August, Yamaguchi suffered AN injury and was defeated in the second round of the 2019 BWF World Championships held in Basel, Switzerland, by 20-year-old Yeo Jia Min of Singapore 0–2. She qualified for the World Tour Finals in Guangzhou and finished as a semifinalist after being defeated by Chen Yufei.^[]

2020–2021

In 2020, Yamaguchi claimed her first title victory of the year at the Thailand Masters, winning against An Se-young in two consecutive games. She was then in the Japanese team that won the Asian Women's team championship.

Yamaguchi competed at the 2020 Summer Olympics as the number four seed. Just like the last edition, she was defeated in the quarterfinals. She lost against P. V. Sindhu. Yamaguchi became the Denmark Open champion for the second time by besting her rival from South Korea, An Se-young. This was also her second super 1000 title. She won her second consecutive title by winning the French Open Super 750 event against Sayaka Takahashi. Her rivalry against An Se-young continued and both met at the Indonesian Masters final. This time Yamaguchi lost to An in two games. Yamaguchi was crowned the World Champion after she defeated Tai Tzu-ying in the final, and with this she became only the second Japanese women's singles player to win the World Championships after Nozomi Okuhara.

2022

At the 2022 All England Open, Yamaguchi defeated Korea's An Se-young in straight sets (21–15, 21–15) to win the women's singles title at the All England Open for the first time. She became the fourth Japanese women's singles player to win the All England Championship after Hiroe Yuki, Etsuko Takenaka and Nozomi Okuhara. In the Asian Badminton Championships in April, Yamaguchi lost 1–2 (21–15 13–21 19–21) in the final to Chinese player Wang Zhiyi, and missed the second consecutive Asian Championships.

On 28 August 2022, Yamaguchi defeated Chinese player Chen Yufei with a score of 2–1 (21–12 10–21 21–14) in the women's singles final of the Tokyo World Badminton Championships, becoming world champion for the second year in a row. She also became the first player in the history of Japanese badminton women's singles to successfully defend her title in the world championships. Yamaguchi was later named the BWF Female Player of the Year 2022. At the BWF World Tour Final held in Bangkok, Thailand in December, she won the championship with a 2–0 (21–18, 22–20) victory over Tai Tzu-ying.