In 2012, Koptelov competed at the 2012 FINA World Swimming Championships (25 m) in Istanbul, Turkey making it to the semi-finals in men's 50 m butterfly.

At the 2013 Summer Universiade in Kazan, Koptelov was member of the Russian Team that won gold in men's 4 × 100 m medley (with Vladimir Morozov, Kiril Strelnikov and Andrey Grechin) and a bronze medal in 100 m butterfly.

In 2015, at the 2015 Summer Universiade in Gwangju, Koptelov won gold in 200 m butterfly clocking in 1:54.79[1] and in 100 m butterfly clocking a final time of 51.50 to win his second gold medal.

[2] He won his third gold with the Russian team in men's 4 × 100 m medley.

This biographical article related to a Russian swimmer is a stub.