Kyohei Yamashita

In 2016, Yamashita competed at junior international level, partnering Naoki Yamazawa in boys' doubles. The pair finished as runners-up at the Dutch Junior before winning the German Junior; they faced Hiroki Okamura and Masayuki Onodera in both finals.^[4][5] That year, Yamashita also represented Japan at the Asian Junior Championships in Bangkok, where the team won a bronze medal.^[6]

Yamashita and Naru Shinoya began competing together in mixed doubles on the BWF World Tour. In 2019, they reached the final of the Akita Masters (Super 100), losing to South Korea's Ko Sung-hyun and Eom Hye-won.^[7] That same year, Yamashita won the Malaysia International in men's doubles with Hiroki Midorikawa.^[8]

In 2021, Yamashita and Shinoya made their Super 750 debut at the Indonesia Masters, where they were eliminated in the first round. They subsequently competed in their first Super 1000 tournament at the Indonesia Open, advancing to the second round. The pair concluded the season at the World Championships in Huelva, winning the mixed doubles bronze medal following a semifinal loss to compatriots Yuta Watanabe and Arisa Higashino.^[9]

Yamashita and Shinoya reached a career-high mixed doubles world ranking of 13 in December 2022. During the 2022 season, the pair advanced to the quarterfinals at the Denmark Open and the Australian Open. In 2023, they reached the semifinals at the German Open and the Canada Open, and the quarterfinals at the All England Open. In men's doubles, Yamashita partnered Midorikawa to win the Osaka International in 2023.^[10] Yamashita represented Japan in team events at both the 2022 Asian Games in Hangzhou and 2023 Sudirman Cup in Suzhou, earning bronze medals on each occasion.

Yamashita and Shinoya began the year pursuing qualification for the 2024 Paris Olympics in mixed doubles. Their best World Tour result was a quarterfinal finish at the Thailand Masters.^[11] The pair did not qualify, and their partnership ended in April when Shinoya retired from the national team.^[12] Yamashita then resumed his men's doubles partnership with Midorikawa. Returning to international competition in August, they won consecutive titles at the Sydney International and the North Harbour International.^[13][14] Domestically, Yamashita and Midorikawa won three major Japanese national tournaments during the year: the Japan Ranking Circuit, the All Japan Members Championships, and the All Japan Championships.^[15][16][17]

Yamashita and Midorikawa continued their partnership throughout 2025. They reached the semifinals at the Swiss Open, having defeated the world No. 2 pair Goh Sze Fei and Nur Izzuddin in the first round,^[18][19] and also advanced to the semifinals at the Taipei Open. In team competition, Yamashita represented Japan at the Sudirman Cup in Xiamen, where the team earned a bronze medal.^[20] He and Midorikawa reached a career-high men's doubles world ranking of 25 on 23 September. The pair concluded the season as runners-up at the Super 500 Japan Masters, losing the final to South Korea's Kim Won-ho and Seo Seung-jae.^[21]

Yamashita and Midorikawa began the 2026 season at the Malaysia Open, where they were eliminated in the second round.^[22] They subsequently reached the final of the Super 750 India Open, finishing as runners-up to China's Liang Weikeng and Wang Chang.^[23] Yamashita formed a new men's doubles partnership with Hiroki Okamura. The pair made their debut at the Swiss Open in March, reaching the second round before losing to Satwiksairaj Rankireddy and Chirag Shetty of India.^[24] Later that month, they finished as runners-up at the Super 300 Orléans Masters.^[25]

Mixed doubles

Year	Venue	Partner	Opponent	Score	Result	Ref
2021	Palacio de los Deportes Carolina Marín, Huelva, Spain	Naru Shinoya	Yuta Watanabe Arisa Higashino	13–21, 8–21	Bronze	[9]

The BWF World Tour, which was announced on 19 March 2017 and implemented in 2018,^[26] is a series of elite badminton tournaments sanctioned by the Badminton World Federation (BWF). The BWF World Tour is divided into levels of World Tour Finals, Super 1000, Super 750, Super 500, Super 300 (part of the HSBC World Tour), and the BWF Tour Super 100.^[27]

Men's doubles

Year	Tournament	Level	Partner	Opponent	Score	Result	Ref
2025	Japan Masters	Super 500	Hiroki Midorikawa	Kim Won-ho Seo Seung-jae	22–20, 11–21, 16–21	Runner-up	[21]
2026	India Open	Super 750	Hiroki Midorikawa	Liang Weikeng Wang Chang	21–17, 23–25, 16–21	Runner-up	[23]
2026	Orléans Masters	Super 300	Hiroki Okamura	Hu Keyuan Lin Xiangyi	19–21, 14–21	Runner-up	[25]

Mixed doubles

Year	Tournament	Level	Partner	Opponent	Score	Result	Ref
2019	Akita Masters	Super 100	Naru Shinoya	Ko Sung-hyun Eom Hye-won	10–21, 17–21	Runner-up	[7]

Men's doubles

Year	Tournament	Partner	Opponent	Score	Result	Ref
2019	Malaysia International	Hiroki Midorikawa	Liang Weikeng Shang Yichen	18–21, 21–10, 21–16	Winner	[8]
2023	Osaka International	Hiroki Midorikawa	Wei Chun-wei Wu Guan-xun	21–14, 21–14	Winner	[10]
2024	Sydney International	Hiroki Midorikawa	Lai Po-yu Tsai Fu-cheng	21–14, 21–16	Winner	[13]
2024	North Harbour International	Hiroki Midorikawa	Lai Po-yu Tsai Fu-cheng	16–21, 21–14, 21–14	Winner	[14]

  BWF International Challenge tournament

Boys' doubles

Year	Tournament	Partner	Opponent	Score	Result	Ref
2016	Dutch Junior	Naoki Yamazawa	Hiroki Okamura Masayuki Onodera	21–17, 11–21, 20–22	Runner-up	[4]
2016	German Junior	Naoki Yamazawa	Hiroki Okamura Masayuki Onodera	21–14, 21–19	Winner	[5]

  BWF Junior International Grand Prix tournament

Key

• Junior level

• Senior level