He won two gold medals at the 2015 Summer Universiade in 100m and 200m butterfly.

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.

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