In 2015, after an injury to David Wright, Murphy was moved to third base on June 4.
He spent the regular season splitting his time between first base, second base, and third base.
Murphy hit the 225th and 226th doubles of his career in a game against the Atlanta Braves on September 22, giving him the second-most doubles in Mets franchise history, ahead of Ed Kranepool and behind David Wright.
In the deciding fifth game of the 2015 National League Division Series (NLDS) against the Los Angeles Dodgers, Murphy had three hits, including the game-winning home run in the sixth inning, to lead the Mets to a 3-2 win.
 He had also scored the Mets' second run of the game, after singling, going first-to-third on a walk, and scoring on a sacrifice foul-out.
For the entire NLDS, Murphy had five RBI and seven hits in 21 at-bats, three of them being home runs and one of them being a double, giving him a 1.143 OPS.

Over the course of the NLDS and 2015 National League Championship Series (NLCS), Murphy became the first person in major league history to hit a home run in six consecutive postseason games, beating a record set by Carlos Beltrán, and became the second person, after Lou Gehrig, to have a hit, a run, and an RBI in seven consecutive postseason games.
He also broke a Mets franchise record for most home runs in the postseason, previously held by Mike Piazza.
He hit .529 with four home runs, a double and six RBI and was named the 2015 NLCS MVP.

During the eighth inning of game 4 of the 2015 World Series against the Kansas City Royals, Murphy made a key fielding error which increased Kansas City's chances of winning the game by 32%.
The Royals went on to win 5-3.
Murphy tallied two errors and only three hits in his 20 at-bats as the Mets lost the five-game series.

During the off-season, the Mets offered Murphy a one-year, $15.8 million qualifying offer.
On November 13, 2015, Murphy rejected the offer, thus becoming a free agent.
This ensured the Mets a compensation draft pick if he signed with another team.
In 2015, after an injury to David Wright, Murphy was moved to third base on June 4. He spent the regular season splitting his time between first base, second base, and third base. Murphy hit the 225th and 226th doubles of his career in a game against the Atlanta Braves on September 22, giving him the second-most doubles in Mets franchise history, ahead of Ed Kranepool and behind David Wright. In the deciding fifth game of the 2015 National League Division Series (NLDS) against the Los Angeles Dodgers, Murphy had three hits, including the game-winning home run in the sixth inning, to lead the Mets to a 3-2 win.  He had also scored the Mets' second run of the game, after singling, going first-to-third on a walk, and scoring on a sacrifice foul-out. For the entire NLDS, Murphy had five RBI and seven hits in 21 at-bats, three of them being home runs and one of them being a double, giving him a 1.143 OPS.
Over the course of the NLDS and 2015 National League Championship Series (NLCS), Murphy became the first person in major league history to hit a home run in six consecutive postseason games, beating a record set by Carlos Beltrán, and became the second person, after Lou Gehrig, to have a hit, a run, and an RBI in seven consecutive postseason games. He also broke a Mets franchise record for most home runs in the postseason, previously held by Mike Piazza. He hit .529 with four home runs, a double and six RBI and was named the 2015 NLCS MVP.
During the eighth inning of game 4 of the 2015 World Series against the Kansas City Royals, Murphy made a key fielding error which increased Kansas City's chances of winning the game by 32%. The Royals went on to win 5-3. Murphy tallied two errors and only three hits in his 20 at-bats as the Mets lost the five-game series.
During the off-season, the Mets offered Murphy a one-year, $15.8 million qualifying offer. On November 13, 2015, Murphy rejected the offer, thus becoming a free agent. This ensured the Mets a compensation draft pick if he signed with another team.
Daniel Murphy (baseball)