2009-10: Maxim Letunov skated for CSKA Moscow's 1996's in his native Russia. He scored 12 goals with 13 assists and 14 penalty minutes in 26 games in Moscow league play and in five tournament games he scored 2 goals with 4 assists and 12 penalty minutes.
2010-11: Letunov played for CSKA Moscow's 1996's — scoring 9 goals with 10 assists and 10 penalty minutes in 24 games.
2011-12: Letunov moved from Russia to the Dallas, TX area and skated for the Alliance Hockey Association's U15 and U16 teams.
2012-13: Letunov was the leading scorer for the Dallas Stars U16 team that advanced to the USA Nationals in Pittsburgh. He scored 29 goals with 37 assists and 6 penalty minutes in 40 regular season games and had 2 goals with 2 assists and 6 penalty minutes in four playoff games. Letunov scored 5 goals with 2 assists in four games at the USA Nationals. The Stars were 3-0 in pool play before losing, 2-1, to Wilkes-Barre Scranton in the tournament quarterfinals. Letunov was selected by Salavat Yulaev Ufa in the first round (26th overall) of the 2013 KHL Draft and chosen by Youngstown in the second round (19th overall) of the 2013 USHL Draft.
2013-14: Letunov skated for Youngstown in the USHL and in November committed to attending Boston University in 2015-16 along with Phantoms teammate J.J. Piccinich. He was Youngstown's third-leading scorer behind Kyle Connor (2015 draft eligible) and Piccinich. Letunov scored 19 goals with 24 assists and was -17 with 42 penalty minutes. Eight of his 19 goals and nine assists came on the Phantoms power play. Youngstown missed the playoffs after finishing last in the Eastern Conference. Letunov was ranked 87th amongst North American skaters in Central Scouting's final rankings prior to the 2014 NHL Draft.