Popov began swimming at age 8 at the
Children and Youth Sports School of Fakel Sports Complex in Lesnoy, at that time afraid of water. However, his father insisted on him taking swimming lessons in that sports school, and in his own words, he has "been stuck there ever since". Popov started out as a
backstroker but switched to
freestyle when he joined
Gennadi Touretski's squad in 1990 on the initiative by the head coach of the
USSR National Team Gleb Petrov. which would last nearly eight years. Popov finished second in the 100 meter freestyle at the 2000 Olympics. At the
2003 Barcelona World Championships, Popov once again made a clean sweep of the men's 50 m and 100 m freestyle events, citing that Barcelona would always be special to him, for it was there that for him, everything first began. He announced his participation in the
2004 Athens Olympics. Moreover, he was the Flagbearer of Russia in
the opening ceremony. Popov was the oldest competitor at the pool, and finished 9th in the men's 50 m and 18th in the 100 m freestyle. He announced his retirement from the sport in January 2005. ==Post swimming==