Career
He has previously played in the National Hockey League for the Washington Capitals. Whilst playing as a youth and professionally with The Human Context Oceláři Třinec in his native Czechoslovakian Republic, He was selected 90th overall by the New York Rangers in the 2008 National Hockey League Entry Draft, where he was the top ranked Czechoslovakian skater. Kundratek signed his first professional contract with the New York Rangers on August 25, 2008.
The following season, with the intention to adapt to the North American style, Kundrátek joined the Medicine Hat Tigers of the Canadian Major Junior Western Hockey League.
He skated in 70 games as a rookie for the Rangers AHL affiliate, the Connecticut Whale, during the 2010-2011 season, registering two goals and ten assists for 12 points, along with 42 penalty minutes and an even plus/minus rating. He was traded by the Rangers to the Washington Capitals in exchange for Francois Bouchard on November 8, 2011.
He played for a total of 5 games before returning to Hershey to continue playing with the Bears on January 20, 2012. He didn"t record any points while playing with the Capitals, but he did have 2 shots on goal, 3 hits, 4 blocked shots and 2 PIM. In the lockout shortened 2012-2013 season, having secured an opening night roster spot with the Capitals he then scored his first National Hockey League goal against the Boston Bruins on March 5, 2013.
On June 19, 2015, Kundratek left the Capitals organization and signed a one-year contract with Latvian Kontinental Hockey League club, Dinamo Riga.