An MLB All-Star in 2015, Rosenthal set the Cardinals' franchise record for saves that season with 48. He was an integral part of the Cardinals' World Series run in 2013, making 74 appearances, while striking out 108 batters, in innings pitched, allowing a 2.63 earned run average (ERA), and converting three saves. Moreover, Rosenthal recorded scoreless innings to begin his postseason career. In 2015, he became the third-youngest pitcher in major league history to record back-to-back 40 save seasons.