Update, 1:14 p.m.: Gio Gonzalez will start Saturday’s game and Nate Karns will be pushed back to Sunday’s doubleheader, Manager Davey Johnson said. Jordan Zimmermann, who last pitched on Tuesday, will also pitch Sunday’s doubleheader. Zimmermann would probably pitch the day game of the split doubleheader on Sunday but the order isn’t set yet, Johnson said.

Since Zimmermann is slated for Sunday, the Nationals will be in need of a start on Wednesday if they don’t want to pitch someone on short rest. Dan Haren last pitched on Wednesday and is scheduled to pitch on six day’s rest on Tuesday in Denver, the extra day coming from Monday’s off day. The Nationals could call up a starter for Wednesday’s start, such as Ross Ohlendorf from Class AAA Syracuse, but Johnson said Ross Detwiler is a candidate to start that day.

Detwiler, who has been on the disabled list since May 16 with an oblique strain, is scheduled to pitch three innings in a rehab start at Class A Potomac on Saturday. With that abbreviated outing, Detwiler could pitch on Wednesday on four days of rest. A final decision, though, hasn’t been made on that game’s starter.

Update, 12:29 p.m.: The Nationals and Twins will play a split doubleheader on Sunday, with the originally scheduled game at 1:35 p.m. and the make-up game at 7 p.m. Tickets for Friday’s rained-out game are good for the 7 p.m. game only. Tickets can also be exchanged for another game with available tickets of equal or lesser value.

There has been no announcement on Saturday’s starter or the rotation. The Nationals appear to be in need of a starter to prevent someone from pitching on short rest. If the Nationals pitch Gio Gonzalez on Saturday and push Nate Karns one game of the doubleheader on Sunday, Jordan Zimmermann could pitch on five day’s rest on Sunday as well. Dan Haren could then pitch on six day’s rest on Tuesday in Denver, the extra day coming from Monday’s off day.

With Stephen Strasburg and Ross Detwiler on the disabled list, the Nationals would need a starter for Wednesday’s game. But, they could use the doubleheader rule which allows teams to call up a 26th player just for the day of a double header. That, perhaps, could be Ross Ohlendorf, who was originally slated to start Saturday but Thursday’s rainout pushed back the rotation. If the Nationals do that, they could use Zimmermann on Tuesday and Haren on Wednesday in Denver.

Original post: The Nationals announced that Friday night’s series-opening game against the Minnesota Twins has been postponed due to inclement weather, the second straight rainout for the Nationals. No make-up date has been announced yet, but the teams could perhaps play a doubleheader on Sunday or play the missed game on Monday, a mutual off day.

Gio Gonzalez, who was supposed to start Thursday’s washed-out game, was scheduled to start Friday. It’s unclear if he will start Saturday but the Nationals could push back their injured rotation another day.