The Washington Nationals are sticking with Tanner Roark for Wednesday's Game 4 against the Chicago Cubs.

Roark was originally scheduled to start the game, which was postponed because of weather on Tuesday. Stephen Strasburg would be pitching on regular four days' rest, but he's ill.

According to Dusty Baker, several Nationals are sick.

"A lot of my team is under the weather with the change of weather, and the air conditioning in the hotel, and the air conditioning here," he said. "It's just this time of the year for mold around Chicago -- I think it's mold. I mean, I have it, too."

The Nationals will look to force a Game 5 against the Cubs beginning at 4:08 p.m. ET at Wrigley Field.