is a retired Japanese swimmer and former world record holder who specializes in the breaststroke.
At the 2011 World Junior Swimming Championships in Lima, Yamaguchi won a total of four medals: one gold and three silvers. His gold came in the 200-meter breaststroke with a time of 2:11.70.
On September 15, 2012, at the National Sports Festival of Japan, he set a new world record in the 200-meter breaststroke (long course) with a time of 2:07.01, bettering the previous record of 2:07.28.
Personal bests
Long course Event Time Meet Date Note(s) 50 m breaststroke 27.69JOC Junior Olympic Cup (2012 Summer)August 30, 2012 100 m breaststroke 59.56Japan Inter-High School ChampionshipsAugust 20, 2012 200 m breaststroke 2:07.01National Sports Festival of JapanSeptember 15, 2012
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