Mezue ahịrịokwu na-esonụ: N'afọ 2012, Koptelov so na asọmpi asọmpi FINA World Swimming Championships nke afọ 2012 (25 m) na Istanbul, Turkey na-eme ya na ọkara ikpeazụ na ụmụ nwoke 50 m butterfly. Na 2013 Summer Universiade na Kazan, Kopelov bụ onye otu ndị otu Russia nke meriri ọla edo na ụmụ nwoke 4 × 100 m medley (ya na Vladimir Morozov, Kiril Strelnikov na Andrey Grechin) na ọla nchara na 100 m butterfly. N'afọ 2014, Koptelov gbara onye nke asatọ na 200 m butterfly na
2014 European Championships.