Martynov made his Kontinental Hockey League (KHL) debut playing with Metallurg Novokuznetsk during the 2013–14 season.
[1] During the 2014–15 season, Martynov was traded by Lokomotiv Yaroslavl, along with Alexei Kruchinin, to Traktor Chelyabinsk in exchange for the rights to Petri Kontiola on November 23, 2014.
[2] Martynov extended his career in the KHL, leaving Metallurg Magnitogorsk after the 2020–21 season and signing a one-year contract with his seventh club, Torpedo Nizhny Novgorod, on 12 July 2021.
[3] After a lone season with Torpedo Nizhny Novgorod, Martynov continued his journeyman career in signing a two-year contract with HC Dynamo Moscow, his eighth KHL club, on 3 May 2022.
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