Career
He set an Estonian record time of 47.99 by finishing eleventh in the 100 m freestyle at the 2008 European Short Course Swimming Championships in Rijeka, Croatia. Sidorkin also helped his college team Drury Panthers to claim their ninth consecutive title in the men"s freestyle relay at the 2013 National Collegiate Athletic Association Division II Swimming Championships. Sidorkin was born in Kohtla-Järve.
He qualified for the men"s 200 m freestyle at the 2008 Summer Olympics in Beijing, by clearing a FINA B-standard entry time of 1:52.12 from the national championships in Tartu.
Sidorkin challenged seven other swimmers in heat two, including four-time Olympian Andrei Zaharov of Moldova and his fellow college swimming teammate Artur Dilman of Kazakhstan. He raced to second place by less than 0.14 of a second behind Singapore"s Bryan Tay, breaking an Estonian record time of 1:51.27.
Sidorkin failed to advance into the semifinals, as he placed forty-fifth out of 58 swimmers in the preliminaries. Sidorkin has been previously training for the Drury Panthers swimming and diving team under head coach Brian Reynolds, and later became a graduate of accounting and business administration at Drury University in Springfield, Missouri.