Mikhail Biryukov (tennis)
Mikhail Sergeyevich Biryukov (Russian: Михаил Сергеевич Бирюков; 28 April 1992 – 4 October 2019) was a Russian junior tennis player. His highest ATP singles ranking was 292. After his retirement from professional tennis at age 22, he was a coach of under 16 player Alexey Zakharov. He was the son of four-time World Champion in modern pentathlon, Irina Kiseleva. He won the silver medal in the inaugural Youth Olympic Games held in Singapore.