Marek was a rising star for Czechoslovakia after World War II, playing for his local team as well as HC Sparta Praha. After the Czech national team lost six players to a plane crash in November 1948, he was selected for the team's appearance at the 1949 Ice Hockey World Championships. The Czech team was looking to repeat it's gold medal from 1947 and rebound from losing the silver to Canada at the 1948 Winter Olympics. Marek only played in 2 games, scoring one goal, but the team was able to win the gold with an unbeaten record.