(Pablo Martinez Monsivais/AP)

UPDATE, 4:24 p.m.: The tarp is off the field and the players are back on. Chien-Ming Wang and Roy Hallday are done. Tom Gorzelanny will come in with two outs in the sixth inning.

UPDATE, 3:18 p.m.: The tarp is coming on the field. And after teasing for nearly an hour, the rain has finally started to fall in the top of the sixth inning. This is likely the end of the day for both pitchers.

Rain looms. Thunder and lightning are building. Heavy thunderstorms are expected to hit by 3 p.m. so this game may not start or finish as expected.

For the Nationals, it may be a blessing in disguise. If the game does start on time but is forced into a rain delay, it may be a way to get around having to face Phillies starter Roy Halladay for an entire game. But Halladay (15-5, 2.53 ERA) is as durable as they come.

The Nationals, who have won two of the past four games against the Phillies, send Chien-Ming Wang (2-2, 4.22 ERA) to the mound for his fifth start. After two rough starts, Wang has improved over the past two outings, showing flashes of his old, sinker-ball-heavy self.

As usual, discuss the game here.