BALTIMORE -- The scheduled opening game of the Baltimore Orioles-Pittsburgh Pirates series was washed out on Tuesday night.

This game was moved back to Thursday, originally scheduled to be an off-day for both teams. They will try again on Wednesday to play, but the weather forecast looks bleak, with rain forecast all day, much like Tuesday.

The Orioles and Pirates might be forced to consider some kind of doubleheader on Thursday if the Wednesday game cannot be played.

Since this is the only time the Orioles and Pirates are scheduled to meet this season in Baltimore, the two teams do not have many options. They are set to play twice in Pittsburgh in May.

The starting pitching matchup will remain the same on Wednesday with right-handers Chris Tillman (3-1, 3.38 ERA) going for the Orioles against Charlie Morton (0-3, 4.35) of the Pirates. On Thursday, Brandon Cumpton pitches for the Pirates against Bud Norris of the Orioles.

This is just the third time that Pittsburgh has played in Baltimore during the regular season. The Pirates have a bit of history here, winning Game 7 of the 1971 World Series and doing it again in 1979. They last played in Baltimore in 2012.

The Orioles did make one roster move on Tuesday, announcing that they signed infielder/outfielder Steve Pearce to a major-league contract. He had gone 1-for-7 in three games earlier this year before being designated for assignment on April 22 and released five days later.

This move likely has something to do with the Orioles having to place first baseman Chris Davis on the 15-day disabled list with left oblique problems. Pearce can fill in at first base, if needed, and gives manager Buck Showalter another option there.

Showalter has used Nick Markakis there in the two games the team has played since Davis went out.

The big news for the Orioles is that third baseman Manny Machado was at the ballpark and ready to go. He had been out all season after undergoing surgery on his left knee last fall.

Baltimore had not officially activated Machado yet, but that is coming when it is game time.

"I'm ready to play baseball," Machado said. "I'm going to go out there and make whatever play comes my way. I'm just going to go out there and whatever comes my way, just go out there and do it and play some baseball and have some fun."