See main article: article and 2018 Keio Challenger.
Yūichi Sugita was the defending champion but chose not to defend his title.
Yasutaka Uchiyama won the title after defeating Tatsuma Ito 2–6, 6–3, 6–4 in the final.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "2018 Keio Challenger – Men's singles".
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