Tadashi Ohtsuka

is a male badminton player from Japan.

Career Otsuka competed in badminton at the 2004 Summer Olympics in men's doubles with partner Keita Masuda. They had a bye in the first round, then were defeated in the round of 16 by Fu Haifeng and Cai Yun of China. He also competed in mixed doubles with partner Shizuka Yamamoto. They were defeated in the round of 32 by Robert Blair and Natalie Munt of Great Britain.

Ohtsuka played at the 2007 BWF World Championships in men's doubles with Keita Masuda, and were defeated in the third round by the eventual champions Markis Kido and Hendra Setiawan, of Indonesia, 22-20, 21-19.

Coaching and academic career Following his retirement from competitive play, Ōtsuka transitioned into coaching and academia. He is currently an Associate Professor in the Department of Physical Education at Nippon Sport Science University.

Achievements BWF Grand Prix (1 title, 1 runner-up) The BWF Grand Prix had two levels, the BWF Grand Prix and Grand Prix Gold. It was a series of badminton tournaments sanctioned by the Badminton World Federation (BWF) which was held from 2007 to 2017. The World Badminton Grand Prix has been sanctioned by International Badminton Federation (IBF) from 1983 to 2006.

Men's doubles Year Tournament Partner Opponent Score Result 2005 Dutch Open Keita Masuda Choong Tan Fook Lee Wan Wah 7–15, 4–15 Runner-up 2007 U.S. Open Keita Masuda Howard Bach Khan Malaythong 21–18, 21–11 Winner BWF Grand Prix tournament IBF World Grand Prix tournament

IBF International Challenge/Series (5 titles, 4 runners-up) Men's doubles Year Tournament Partner Opponent Score Result Ref 1999 Mexico International Keita Masuda Ma Che Kong Yau Tsz Yuk 7–15, 15–13, 10–15 Runner-up 2000 Cuba International Keita Masuda José Antonio Crespo Sergio Llopis 15–9, 15–2 Winner 2000 French International Keita Masuda Takuya Katayama Yuzo Kubota 15–6, 15–11 Winner 2003 Waikato International Keita Masuda Hendri Saputra Denny Setiawan 7–15, 15–12, 3–15 Runner-up 2003 Guatemala International Keita Masuda Howard Bach Kevin Han 15–6, 15–12 Winner 2004 Iran Fajr International Keita Masuda Liu Kwok Wa Albertus Susanto Njoto 4–15, 11–15 Runner-up 2004 Mauritius International Keita Masuda Liu Kwok Wa Albertus Susanto Njoto 15–11, 15–8 Winner

Mixed doubles Year Tournament Partner Opponent Score Result Ref 2003 Mauritius International Shizuka Yamamoto Kristof Hopp Kathrin Piotrowski 10–15, 15–7, 15–7 Winner 2003 Waikato International Shizuka Yamamoto Daniel Shirley Sara Petersen 4–15, 8–15 Runner-up BWF International Series tournament