In the bottom of the 6th inning of a 2-2 game New York Mets starting pitcher Mike Pelfrey (15-9) came to the plate with 2 outs and the go-ahead run on 2nd base.  Pelfrey singled between shortstop and third to drive in that go-ahead run, then pitched out of a 1-out, 2 runners on jam in the top of the 7th by inducing Pittsburgh Pirates LF Jose Tabata to ground out weakly to pitcher and striking out their 2B Neil Walker to end the threat.  The Mets added an insurance run in the 7th on an Ike Davis sacrifice fly and 2 in the 8th on a 2-run double by Angel Pagan for the eventual final score of 6-2.  Pedro Feliciano and Bobby Parnell each tossed a scoreless frame to finish up the game and the 4-game sweep which puts the Mets 1 game over .500 at 74-73 while reducing the Pirates to 48-98.Prior to all that the Mets had fallen behind 2-0.  In the top of the 2nd inning Pelfrey allowed a 1-out double to Pedro Alvarez who scored on a John Bowker single to make it 1-0 Pirates.  Then in the top of the 4th Ronny Cedeno tripled to drive in Garrett Jones and the Pirates were up 2-0.  Just prior to that Cedeno triple Bowker came up with 2 runners on and hit a long drive to deep right center field that Pagan made a nice diving catch on, then got up and fired the ball to the infield to double off Alvarez at 1st base.  Alvarez had run past 2nd base on the play.  The Mets got one back in the bottom of the 4th when Lucas Duda, who came into the game 1 for 37 in the major leagues, doubled to drive in Davis and Josh Thole to tie the game a 2 runs apiece.  Duda hit a 2nd double later and scored on the aforementioned Pelfrey score