Kasidit Samrej
Kasidit Samrej is a Thai tennis player.
He has a career high ATP singles ranking of world No. 346 achieved on 25 August 2025. He also has a career high ATP doubles ranking of No. 822 achieved on 12 June 2023. He is currently the No. 1 Thai player.
Samrej represents Thailand [Davis Cup team|Thailand] at the Davis Cup, where he has a W/L record of 10–8.
Samrej won the Asia-Pacific Wildcard Playoff for the 2025 [Australian Open - Men's singles|2025 Australian Open], making him the first Thai man to compete in the singles event in a Grand Slam tournament since Danai Udomchoke at the 2012 Australian Open. He lost in the first round to fifth seed Daniil Medvedev in five sets.
ATP Challenger and ITF World Tennis Tour finals
Singles: 9 (4–5)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | M25 Chiang [Rai province|Chiang Rai], Thailand | World Tennis Tour | Hard |  dts|Jun 2023 |