BALTIMORE - The only action seen at Camden Yards after 7 p.m. Wednesday was Josh Hamilton and several of his Texas Rangers teammates sliding across the tarp as the rain continued to fall.

The Baltimore Orioles and Rangers waited about an hour for the weather to clear up before calling it a day, postponing the third contest of their four-game set until today.

It is the first rainout of the Orioles' season.

Baltimore and Texas will play a single-admission doubleheader with the first game starting at 4:05 p.m. and the second beginning no earlier than 7:05 p.m.

Tickets for Wednesday's postponed contest can be exchanged for equal-value tickets to the doubleheader. Tickets for today's originally scheduled game will also be accepted.

Orioles left-hander Wei-Yin Chen (2-0) will face Rangers right-hander Colby Lewis (3-1) in the first game and Baltimore righty Tommy Hunter (2-1) will be called up to face Rangers left-hander Derek Holland (2-2) in the second contest.

Hunter was demoted to Class AAA Norfolk Monday, and a player will be placed on the disabled list between games to make room for him.

ANOTHER ROSTER MOVE: With outfielder Endy Chavez still bothered by a strained intercostal muscle in his ribcage, the Orioles called up utility man Steve Tolleson from Norfolk and optioned left-hander Zach Phillips to the Tides Wednesday.

"We need the depth in the infield," Showalter said. "He can play left field, right field, short, third, second. We feel like he serves a need we have. He's probably swinging the bat as well as anybody they've got down there. I was impressed with him in the spring."

Ryan Flaherty was scheduled to start Wednesday's rainout in left in Chavez's place.

Tolleson, 28, batted .265 with a homer, 11 RBIs and a .357 on-base percentage in 25 games with Norfolk. He played 25 major-league games with Oakland in 2010.

Phillips had been called up Tuesday and allowed Josh Hamilton's third homer, being charged with two runs in two-thirds of an inning.

Catcher Taylor Teagarden (back) was moved to the 60-day DL to make room for Tolleson on the 40-man roster.

DAVIS ON HAMILTON: Orioles first baseman Chris Davis had a different perspective of Hamilton's historic four-homer performance Tuesday - the two were teammates with the Texas Rangers from 2008-11.

Before Wednesday's game, Davis marveled at Hamilton becoming the 16th player to clear the fence four times in one contest.

"That was something," he said. "Obviously, you don't want to be on the other end of that, but at the same time, you have to respect it, take a minute to step back and realize how special that was. It wasn't like we were just rolling the ball up there. He was hitting pitches out to dead center and left-center with some authority. That's the kind of player he's capable of being.

"Everybody always thinks what might've been if hadn't gone down that road [to drug addiction], but I think we're catching a glimpse of just how talented he really is."