N'afọ 2012, Koptelov so sọọ mpi n'asọmpi asọmpị FINA World Swimming Championships nke afọ 2012 (25 m) na Istanbul, Turkey wee ruo ọkara-ikpeazụ n'asọmpi 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 Championship
Ọ dị mma.