HOUSTON — While the Mets haven’t officially revealed left-hander Jonathon Niese as Saturday’s starter, the pitching matchups are set for their three-game series with the Astros that starts Friday night at Minute Maid Park.

Here is the breakdown:

Friday — LHP Johan Santana (11-7, 2.92) vs. LHP Mike Hampton (5-7, 4.63), 8:05 p.m., SNY. Saturday — Niese (0-0, 5.91) vs. RHP Russ Ortiz (3-4, 4.33), 7:05 p.m., PIX-11.

Sunday — RHP Livan Hernandez (6-5, 4.93) vs. RHP Brian Moehler (7-5, 4.92), 2:05 p.m., SNY.