 He also made his first postseason appearance, pitching in three games in the 2011 American League Division Series against the Texas Rangers.He was eligible for salary arbitration after the season but signed a new one-year contract with the Rays

On June 19, 2012, during a game at Nationals Park vs the Washington Nationals, Peralta was ejected from the game for having a "foreign substance" in his glove; it was later found to be pine tar.Peralta was subsequently suspended eight games by Major League Baseball.