Mets 6, Pirates 2: Ike Davis homered twice and drove in a career-high five runs as host New York stretched its winning streak to four games by defeating slumping Pittsburgh.

Davis belted a two-run homer over the left-center field fence in the fourth inning and cracked a three-run blast in the fifth to become the first Mets’ player to reach 30 homers since Carlos Delgado slugged 38 and David Wright hit 33 in 2008.

Pittsburgh lost for the 14th time in 17 games and slipped three games below .500. The Pirates are trying to avoid their 20th consecutive losing campaign.

Jenrry Mejia (1-1) allowed four hits over five scoreless innings for his first major-league victory in six career decisions. Pittsburgh broke the shutout in the eighth, when Andrew McCutchen tripled and scored on a single by Garrett Jones, and added a ninth-inning run on a single by Jose Tabata.

Wright had a run-scoring single in the fifth inning off Kyle McPherson (0-2) prior to Davis’ second home of the game, which came against reliever Jeff Karstens. McPherson was charged with four runs and four hits in 4 1/3 innings.

GAME NOTEBOOK: Wright went 1-for-3 and raised his career hit count to 1,416, two shy of matching Ed Kranepool’s franchise record. … NL batting leader McCutchen went 1-for-3 to keep his average at .336. … The multi-homer game was Davis’ third of the season. He hit three homers against the Arizona Diamondbacks on July 28 and two against the Houston Astros on August 26.