[1] Sergiy competed for Ukraine at the 2009 FIVB Beach Volleyball U19 World Championships, held in Alanya, where he won a gold medal with Valeriy Samoday.

[2] Popov and Samoday won a gold medal at the 2011 FIVB Beach Volleyball U21 World Championships, held in Halifax.

[4] In the next year, they represented Ukraine at the 2012 European U22 Beach Volleyball Championships, where Samoday and Popov also won gold medals.

[12] In 2022, Popov and Reznik competed at the Volleyball World Beach Pro Tour,[13] where they won three silver and one bronze medals.

[14][15][16] Reznik and Popov competed for Ukraine at the 2023 European Beach Volleyball Championships, held in Vienna, where they won bronze medals.