Ku qor sii wadida cutubkan - Sannadkii 2012, Koptelov wuxuu ku tartamay 2012 FINA World Swimming Championships (25 m) oo ka dhacday Istanbul, Turkey isagoo ku guuleystay semi-finalka 50 m butterfly. 2013 Summer Universiade ee Kazan, Kopelov wuxuu xubin ka ahaa Kooxda Ruushka ee ku guuleystay dahabka ragga 4 × 100 m medley (oo ay weheliyaan Vladimir Morozov, Kiril Strelnikov iyo Andrey Grechin) iyo bilada naxaasta ah ee 100 m balastar. Sanadkii 2014, Koptelov wuxuu kaalinta 8-aad ka galay 200 m oo ah shimbir shimbir ah oo ka tirsan Koobka Yurub ee 2014
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