Taisei Ichikawa (市川泰誠, born 21 December 2000) is a Japanese tennis player.

Ichikawa has a career high ATP singles ranking of world No. 636 achieved on 27 January 2025 and a career high ATP doubles ranking of No. 265 achieved on 2 March 2026.

Ichikawa made his ATP main draw debut at the 2023 Japan Open Tennis Championships after qualifying for the doubles main draw with Masamichi Imamura. Again teaming up with Imamura, he won his first ATP Challenger doubles title at the 2026 President's Cup, defeating Petr Bar Biryukov and Grigoriy Lomakin in the final.

ATP Challenger and ITF Futures/World Tennis Tour Finals

Singles: 3 (3 runner-ups) Legend (singles)ATP Challenger Tour (0–0)ITF Futures/World Tennis Tour (0–3)Titles by surfaceHard (0–3)Clay (0–0)Grass (0–0)Carpet (0–0)

ResultW–LDateTournamentTierSurfaceOpponentScoreLoss 0–1 Dec 2023M15 Yanagawa, JapanWorld Tennis Tour Hard Hikaru Shiraishi 3–6, 6–2, 1–6Loss 0–2 Aug 2024M25 Nakhon Si Thammarat, ThailandWorld Tennis Tour Hard Leo Borg 4–6, 7–6(8–6), 3–6Loss 0–3 May 2026M15 Wuning, ChinaWorld Tennis Tour Hard Park Ui-sung 2–6, 3–6

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