Whakaotihia te rerenga e whai ake nei: I te tau 2012, i whakataetae a Koptelov i te 2012 FINA World Swimming Championships (25 m) i Istanbul, Turkey i tae atu ki te haurua whakamutunga i te 50 m butterfly a nga taane. I te 2013 Summer Universiade i Kazan, Kopelov ko te mema o te Rūhia Team i riro koura i roto i nga tangata 4 × 100 m medley (ki Vladimir Morozov, Kiril Strelnikov ko Andrey Grechin) me te mētara parahi i roto i te 100 m butterfly. I te tau 2014, i mutu a Koptelov i te 8th i te 200 m butterfly i te
Ko te 2014 European Championships.