Arrieta started the 2015 National League Wild Card Game, He pitched a complete-game shutout, striking out 11 batters and allowed only four hits to defeat the Pittsburgh Pirates 4–0. He became the first pitcher to post a postseason shutout while striking out at least 10 batters and walking zero. He is also the first pitcher to have more stolen bases than runs scored in a postseason game when he stole second base in the top of the 7th inning. Arrieta was the pitcher of record in the Game 2 loss of the 2015 National League Championship Series to the New York Mets.