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In 2017, Martin Dúbravka made his debut for Sunderland United. He joined the club on loan from Sparta Prague and quickly established himself as the team's first-choice goalkeeper. Dúbravka made a total of 30 appearances for Sunderland during the 2017-18 season, keeping 10 clean sheets. He was a key player for the team as they narrowly avoided relegation from the Premier League.