Oleg Kostin

Oleg Olegovich Kostin (Russian: Олег Олегович Костин; born 6 May 1992) is a Russian swimmer. He competed in the men's 50 metre butterfly event at the 2017 World Aquatics Championships. At the 2018 European Championships in Glasgow, he won a bronze in the 50 metre butterfly, setting a Russian 50 metre butterfly record of 22.97 seconds.

Oleg Kostin

Oleg Olegovich Kostin (Russian: Олег Олегович Костин; born 6 May 1992) is a Russian swimmer. He competed in the men's 50 metre butterfly event at the 2017 World Aquatics Championships. At the 2018 European Championships in Glasgow, he won a bronze in the 50 metre butterfly, setting a Russian 50 metre butterfly record of 22.97 seconds.