 Ṣẹkún gbólóhùn tó tẹ lé e yìí: Ní ọdún 2012, Koptelov díje ní : 2012 FINA World Swimming Championships 25 m ní Istanbul, Turkey tí ó ṣe é dé ìpele ìparí nínú àwọn ọkùnrin 50 m butterfly. Ni 2013 Summer Universiade ni Kazan, Kopelov je omo egbe Russia ti o gba goolu ninu 4 × 100 m medley awon okunrin pẹlu Vladimir Morozov, Kiril Strelnikov ati Andrey Grechin ati ami idẹ ninu 100 m butterfly. Ni 2014, Koptelov pari 8th ni 200 m butterfly ni 2014 European Championships. 