Yaroslav Aleksandrovich Demin (, born 30 August 2005) is a Russian professional tennis player. He has a career-high ATP singles ranking of No. 624 achieved on 4 November 2024 and a doubles ranking of No. 755 reached on 30 March 2026.
Demin plays mostly on ITF Men's Tour.
Demin had remarkable results on the ITF junior circuit, maintaining a 104âÂÂ53 singles win-loss record. In March 2023, he won the Banana Bowl, a top junior-level event hosted in Criciúma, Brazil. He defeated Brazilian João Fonseca in the final.
A few months later, Demin earned his biggest title at junior-level: A major in the boys' doubles category at the 2023 French Open, playing with Mexican Rodrigo Pacheco Méndez. He also was a runner-up in singles at 2023 Wimbledon, losing to local player Henry Searle in straight sets.
Demin reached an ITF junior combined ranking of world No. 1 on 17 July 2023.