That Oriole magic, noticeably lacking during the second season, returned to Memorial Stadium tonight. Eddie Murray's two-out bloop single climaxed a two-run rally in the bottom of the 11th inning and produced a 3-2 victory over Seattle for a Baltimore team that was unable to record an earned run.

The Mariners had moved in front in the top of the 11th on a sacrifice fly by Lenny Randle, making his first plate appearance since his ninth-inning homer beat Baltimore Monday.

As the Orioles had managed only five hits, two out of the infield, against Seattle right-hander Jim Beattie, hopes were not high among the faithful in the crowd of 9,672 when the bottom third of the order took its swings in the 11th.

Help came from Seattle shortstop Jim Anderson, a late-inning replacement who had lost his starting job because of 13 errors. He quickly committed two more, kicking Doug DeCinces' routine grounder, then throwing the ball into his team's dugout.

Beattie left, once again undeservedly winless, although he has not yielded an earned run in his last two starts, covering 18 innings. He could get sympathy from Glenn Abbott, who pitched a two-hitter here Tuesday and lost, 1-0.

Lefty Shane Rawley relieved and the Orioles pulled even when pinch hitter Benny Ayala poked a one-out single to right. It was the seventh RBI for Ayala, suffering from such a slump that he could not remember the previous run he batted in.

A poor bunt by Al Bumbry resulted in a force play, but Lenn Sakata lined a single past Rawley's ears to send Bumbry to third. Right-hander Larry Andersen was called to the mound and threw an intentional fourth ball to Ken Singleton, filling the bases, after falling behind, 3-1. Murray then dropped a check-swing blooper in front of charging Tom Paciorek in left field.

"That's the kind of hit that gets you in the World Series," said Manager Earl Weaver, who will take any kind of hit from a team that is batting .205 in 14 poststrike home games.

Tim Stoddard earned the victory by fanning the only man he faced, catcher Terry Bulling, with the bases loaded in the top of the 11th.

Baltimore starter Dennis Martinez matched Beattie in yielding five hits over 10 innings. With one out in the 11th, singles by Paciorek and Richie Zisk, a career .476 batter against Martinez, brought Tippy Martinez on in relief. Pinch hitter Randle sent his first pitch to the warning track in left, Paciorek scoring easily. A walk and Martinez' error filled the bases before Stoddard silenced the Mariners.