The pitching matchups are in as the Mets try to hold on to their slim lead in the NL East by taking on the Nationals in a two-game set that starts Tuesday night at Shea Stadium. Here is the breakdown:

Tuesday — LHP John Lannan (8-13, 3.88) vs. LHP Oliver Perez (10-7, 3.86), 7:10 p.m., SNY.

Wednesday — LHP Odalis Perez (6-10, 4.19) vs. RHP Mike Pelfrey (13-9, 3.62), 7:10 p.m., SNY.