Career
He is a multiple-time national record holder and a five-time medalist for the freestyle, medley, and relay swimming events at the Asian Indoor Games (2007 in Macau, China and 2009 in Hanoi, Vietnam). Dilman qualified for the men"s 200 m freestyle at the 2008 Summer Olympics in Beijing, by clearing a FINA B-standard entry time of 1:52.42 from the Kazakhstan Open Championships in Almaty. He challenged six other swimmers in heat two, including four-time Olympian Andrei Zaharov of Moldova, and his current college teammate Vladimir Sidorkin of Estonia.
He raced to fifth place by 0.24 of a second behind Algeria"s Mahrez Mebarek with a time of 1:52.90.
Dilman failed to advance into the semifinals, as he placed fifty-second out of 58 swimmers in the preliminaries. On June 17, 2012, Dilman ordered a six-month suspension by the Kazakhstan Swimming Federation, after he was tested positive for a banned substance methylhexaneamine, following an in-competition doping test at the ENKA Open in Istanbul.
On March 13, 2013, Dilman helped out his college team Drury Panthers to claim their ninth consecutive title in the men"s freestyle relay at the National Collegiate Athletic Association Division II Swimming Championships. Dilman is currently playing for the Drury Panthers swimming and diving team under head coach Brian Reynolds, and a sports management major at the Drury University in Springfield, Missouri.