is a Japanese badminton player from Tonami club. In 2013, Kozai started to training on Ryukoku University. He has competed in badminton tournaments including the 2008 Thailand Open, the 2009 Malaysia Open Grand Prix Gold and the 2013 Japan Open
Career At the 2013 Japan Open, Kozai produced a massive first-round upset on his home stage. Entering the tournament as a qualifier ranked World No. 287, he unexpectedly defeated the tournament's second seed, Chen Long of China. Kozai secured the victory in straight games, saving a game point in a tight first game to win the match 24-22, 21–16.
Achievements BWF International Challenge/Series Men's singles Year Tournament Opponent Score Result Ref2009Austrian International Yeoh Kay Bin21–12, 12–21, 21–15 Winner 2011Singapore International Wisnu Yuli Prasetyo21–17, 23–21 Winner2013Osaka International Jun Takemura21–15, 21–15 Winner BWF International Challenge tournament BWF International Series tournament
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