Mets outfielder Curtis Granderson robbed Chris Coghlan of a homer, stole two bases and scored twice. Murphy became the first player since Tampa Bay slugger Evan Longoria in 2008 to homer in four consecutive postseason games.
The best-of-seven series shifts to Wrigley Field on Tuesday night, with New York ace Jacob deGrom scheduled to pitch against Kyle Hendricks. The wild-card Cubs need a comeback to capture their first pennant in 70 years.
Arrieta gave up hits to his first three batters and was pulled after five innings – matching his shortest start of the year.
Slumping star David Wright put the Mets in front with a hit-and-run double in the first. Murphy followed with a two-run shot.
(Copyright 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)