Shunsuke Mitsui (born 20 May 2002) is a Japanese tennis player. Mitsui has a career high ATP singles ranking of No. 517 achieved on 20 April 2026 and a career high ATP doubles ranking of No. 431 achieved on 28 September 2026.
Mitsui has won one ATP Challenger doubles title at the 2025 Champaign Challenger.
Mitsui played college tennis at Tennessee.
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