Right-hander Blake Treinen will start the first game Thursday, while left-hander Gio Gonzalez, Wednesday's scheduled starter, will pitch the second game at Nationals Park.
The Nationals, who currently lead the race for the National League's best record and home-field advantage throughout the NL playoffs, are also playing a split doubleheader on Friday against the Marlins in D.C. Right-handers Taylor Hill and Doug Fister will pitch in those games. It has not yet been decided who will go first.
||ATL and PHI
||Sept. 2 & 3
||NYY and BOS
||Sept. 16 & 17
||MTL and LA
||July 7 & 8*
||DET and BOS
||Aug. 6 & 7**
Hill was in the instructional league getting ready for Friday's start, which will be his first in the big leagues. This will be Hill's second big league stint with the Nationals. He made his Major League debut on June 25 against the Brewers. He went on to allow two runs and 4 1/3 innings as a reliever.
"It's not ideal, but we can't do much about the weather," manager Matt Williams said. "The weather is pretty bad tonight. It looks like it's not getting out of here before tomorrow morning. Rather than wait around all night and get out of here late, we decided to play two tomorrow. We are not the only team that's had to play a doubleheader this year."
Williams said the regulars will play one game of each doubleheader on Thursday and Friday.
"We have a lot of position players here, so a lot of the guys that are here will get a chance to play the next two days," Williams said.
The moves mean Stephen Strasburg will pitch Saturday against the Marlins, while Jordan Zimmermann, who is dealing with shoulder issues, will pitch the final game of the regular season. Tanner Roark most likely will pitch out of the bullpen the rest of the way.
The Nationals play the first game of the National League Division Series starting Oct. 3, at home. Their opponent has yet to be determined.
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the time. He also could be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.