No makeup date was announced. It was Detroit's last scheduled game at Camden Yards this season.
The banged-up Orioles welcomed the rainout. Utility infielder Chris Gomez was put on the 60-day disabled list because of a broken bone in his left hand.
He joins second baseman Brian Roberts and catcher-designated hitter Javy Lopez on the DL. Third baseman Melvin Mora, who planned to play Thursday with an ailing back, was delighted to hear of the postponement.
"I was hoping they would cancel the game," he said. "It's bad for Detroit because they have to come back here, but I feel a little pain. One more day, 24 hours, I think I'll be better."
Earlier, Mora said, "I'm in the lineup because we have no players."
By Friday, the Orioles will also be 24 hours closer to getting Lopez and Roberts back. Lopez (back strain) expects to be activated on Saturday, and Roberts (strained groin) is eyeing a Monday return.
Asked before the rainout was announced if he was hoping for a postponement, Baltimore manager Sam Perlozzo said, "That's a cop-out answer to say yes. We've got games to play, and sooner or later those things get backed up."
He then paused for a moment and added, "Nobody says the next time is going to be better, but it wouldn't hurt to have our guys rested a little bit more. It gives us one more day that our guys on the DL don't miss."
Both teams moved their scheduled starting pitchers back to Friday. Erik Bedard will pitch for Baltimore against Kansas City, and Kenny Rogers will go for the Tigers at Cleveland.
Bruce Chen, who had been slated to start Saturday for Baltimore, will be skipped in the rotation for the second time in a row. He now goes Tuesday against Boston.
The postponement means the Tigers will probably have to return to Baltimore for one game. But manager Jim Leyland gets another day to ponder whether to put ailing Dmitri Young on the disabled list with a strained right quadriceps, the same injury that put the outfielder on the DL in mid-April.
"It's lingering. It's not nearly as bad as it was; it's not like we're starting from scratch. But it spasms up on him," Leyland said. "It's not right, and you can see that. He's uncomfortable at the plate.
"It's a long season and we need to get him right. He's a professional hitter, he hits left-handed, and I need him bad. But it's not fair to ask him to hit right now."
Young is willing, but hurting.
"It's bothering me, and I need to get this healed," he said. "If that doesn't happen soon, for the team, we'll need to bring someone up."
When the Orioles resume play, they will purchase the contract of infielder Ed Rogers from Triple-A Ottawa. Rogers will replace Gomez, who broke his hand when he was hit by a pitch from Detroit's Joel Zumaya on Wednesday night.
"I knew right away I was probably going to be out for a while. It's disappointing it's broken, but doctors are saying it's pretty clean and no surgery is necessary," Gomez said. "It should heal fine."
Rogers played five games with the Orioles in 2002 and eight last season. He can't wait to add another stint to the list.
"I just found out last night. It feels so good to be here," the rookie said. "That's why we work over here. That's the goal."