Maryland's 33-game winning streak at Shipley Field ended yesterday. But it took the Baltimore Orioles to do it.

The Orioles hit five home runs to defeat Maryland, 12-6, in an exhibition game before an overflow crowd of approximately 4,000 at Shipley.

The Terrapins will play host to George Mason today and if they win, the official winning streak, against college competition, will continue.

Baltimore, using its regular starting lineup, scored four runs in the first inning on two-run homers by Ken Singleton and Dan Ford. Ford's came off a hanging curve ball from Maryland starter Bob Payne and traveled 380 feet over the left-center fence.

The Orioles got two runs in the second on Rick Dempsey's single and Singleton's sacrifice fly.

Maryland scored its first runs in the bottom of the inning on Tom Weider's two-run homer off Mark Brown, who pitches for the Hagerstown Suns, Baltimore's Class A affiliate. Steve Johnson had a run-scoring single in the third.

"I was disappointed that we weren't facing major league pitching," Weider said. "I was really looking forward to hitting against (Steve) Stone (who still has a sore arm and couldn't pitch), but it was a big thrill just to play against the Orioles and I'm not going to complain."

The Orioles added single runs in the third on Jose Morales' long homer and in the sixth on Bob Bonner's opposite-field homer off Mike Romanovsky, who pitched four impressive innings. Romanovsky, a sophomore left-hander, allowed only the one run on two hits and struck out three. He fanned Terry Crowley twice, once swinging and the other looking at a knee high fast ball on the outside corner.

Maryland got within 8-6 in the seventh when Jimmy Brooks lined a three-run home run over the right field fence off another minor-league pitcher, Charlie Guinn. Brooks' homer followed Dub Daniels' single and Bob Zavarick's second double of the game.

But the Orioles ended Maryland's hopes with a four-run eighth inning off reliever Mike Lavin. Morales opened the inning with a single and Cal Ripken Jr. walked. Gary Roenicke singled for one run and Lenn Sakata followed with a three-run homer to left field for the final margin.

"I think the game helped to relax us because it was just total and complete fun," said Ripken, who went hitless in three official at bats, but scored a run. "I don't know if we will do this every year, but I really enjoyed it. It was great fun."

"It was . . . a good learning experience for me," Weider said. "I was able to learn so many things just by watching those guys play. I was so excited today that I didn't even eat. I just came out to watch them take batting practice."