Junya Koga (古賀 淳也 Koga Junya born July 19 1987 in Kumagaya Saitama) is a Japanese backstroke swimmer. He is a Waseda University student in Tokyo.In May 2009 he set the Japanese records in the 50 m and 100 m backstrokes at the 2009 Japan Championships qualifying for Japan’s team to the 2009 World Championships.
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