The game was originally scheduled for Sunday, but was postponed due to rain.
Maine (4-3) allowed two runs on five hits through 6 1/3 innings. He has now won all three of his career outings against the Phillies, all this season.
Paul Lo Duca and David Wright also drove in two runs each for the Mets, who have won nine of their last 10 games as they continue to run away with the NL East.
Ryan Howard hit his 47th home run of the season while Pat Burrell also homered for the Phillies, who lost for just the third time in nine games. Howard's homer moved him one behind Hall-of-Famer Mike Schmidt for the Phillies' single-season record, which Schmidt set in 1980.