That postseason, Rosenthal continued his dominance. He pitched more scoreless innings in the NLDS against the Pittsburgh Pirates, the NLCS against the Los Angeles Dodgers, and the World Series against the Boston Red Sox, striking out 18 of the 40 batters he faced and allowing just four hits. In Game 2 of the NLCS, he entered in the ninth with fellow rookie Michael Wacha's five-hit shutout and one-run lead on the line, striking out the side to end the game. He also tallied one win and four saves. Spanning his 2012 and 2013 postseasons, Rosenthal did not allow a run in postseason innings, allowing just six hits and striking out 33, for an average of 14.6 K/9.