Mamin, a center, made his NHL debut with the Florida Panthers in 2017-18 and finished with four points (three goals, one assist) in 26 games 2017-18. He provided a physical presence with 51 hits.
The Panthers selected Mamin in the sixth round (No. 175) of the 2016 NHL Draft, and he signed a two-year contract on June 2, 2017. The Moscow native started his first season in North America at Springfield of the American Hockey League. He made his NHL debut against the Columbus Blue Jackets on Jan. 7, 2018, and scored his first NHL goal Feb. 22, 2018, in a 3-2 victory against the Washington Capitals.