Kosei Yamaguchi

is a Japanese long-distance runner. In 2019, he competed in the senior men's race at the 2019 IAAF World Cross Country Championships held in Aarhus, Denmark. He finished in 80th place.

In 2017, he competed in the senior men's race at the 2017 IAAF World Cross Country Championships held in Kampala, Uganda. He finished in 73rd place.

In 2018, he competed in the men's 3000 metres steeplechase event at the 2018 Asian Games held in Jakarta, Indonesia. He finished in 9th place.

In 2019, he competed in the men's 3000 metres steeplechase event at the 2019 Asian Athletics Championships held in Doha, Qatar. He finished in 6th place. Provided by Wikipedia
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