He also won a gold medal, as a member of the Russian team, in the 4×200 m freestyle relay (7:28.25) at the 2002 European Junior Swimming Championships in Linz, Austria.

[2] Zatsepin qualified for two swimming events at the 2004 Summer Olympics in Athens, by clearing a FINA A-standard entry time of 2:02.15 (200 m individual medley) from the Russian Championships in Moscow.

[3] He also teamed up with Maksim Kuznetsov, Yevgeniy Natsvin, and Stepan Ganzey in the 4×200 m freestyle relay.

Swimming the second leg, Zatsepin recorded a split of 1:51.75, and the Russian team finished the heats in eleventh overall with a final time of 7:23.97.

[6][7] Zatsepin retired from his sporting career in 2005 to serve as an assistant coach for the swimming team at Kama State Institute of Physical Culture in his home town Naberezhnye Chelny.