Starting Game 1 of the 2015 NLDS, he allowed no runs and five hits over seven innings pitched and tied a Mets franchise postseason record with 13 strikeouts (set by Tom Seaver, Game 1 of the 1973 NLCS). DeGrom won the deciding Game 5 with a six-inning, two-run effort. In Game 3 of the 2015 NLCS against the Chicago Cubs, deGrom pitched seven-inning game, allowing just two runs on four hits, one walk and seven strikeouts, putting the Mets ahead 3–0 and within one game of their first World Series appearance since the 2000 Subway Series.