Oriole pitcher Mike Flanagan, getting offensive help from center fielder Gary Roenicke, shut out California on six hits for his 13th victory tonight as Baltimore defeated the Angels, 3-0, and earned a split of their doubleheader at Memorial Stadium. The Angels won the first game, 4-3, on an RBI single by Dan Ford in the top of the 11th inning.

A crowd of 33,603 watched the first-place orioles open their home stand.

In the nightcap, Roenicke scored the Orioles' first run, on a line drive by Rick Dempsey, in the fifth inning and then drove hom two runs with his second consecutive double in the sixth inning for Flanagan's insurance runs.

The Orioles, who finished the first game under protest, forced the contest into extra innings by scoring three times in the ninth to tie at 3-3.

Miller led off the 11th with a single to left, the Angels' first hit off starter Dennis Martinz (1207) since the fifth inning. Carney Lansford bunted, but shortstop Kiko Garcia let the throw from Martinez get by him at second, setting the stage for Ford.

Baltimore Manager Earl Weaver protested the game in the bottom of the 10th when, during an argument between Angel Manager Jim Fregosi and umpire John Shulock, Califonia reliever Dave LaRoche threw some warmup pitches. Weaver contended that in a similar situation in Oakland, his pitcher had not been allowed warmups.

"There's no chance we can lose both protests," Weaver said. "We have to replay one of them from the point of infraction. It's the same situation." The American League office is scheduled to rule on the Oakland game Friday.

Down, 3-0 the Orioles finally began their comeback in the bottom of the ninth when Edie Murray led off with a single and John Lowenstein followed with a walk. Designated hitter Lee May then singled between third and short to bring in Baltimore's first run.

Rich Dauer laid down a bunt directly in front of the plate that Mark Clear had trouble handling. By the time Clear had checked off third and second, Dauer might have been safe at first. Instead, he reamained in the batter's box while Clear threw to Bobby Grich at first for the Birds' first out.

Billy Smith then tied the contest with a two-run single to right, scoring Lowenstein and May.

California struck for its 3-0 lead in the first inning, thanks in part to a towering two-run homer by rookie twillie Mays Aikens.

The Angels earned their first run when center fielder Miller singled to left, Lansford was hit by a pitch and Ford moved them both ahead with a bunt.

Don Baylor, the Angels' designated hitter, followed with his 86th RBI (tops in the major leagues) on a sacrifice fly to Oriole left fielder Lowenstein.

Aikens, substituting for the injured Rod Carew, followed Baylor's fly ball with a blast to straightaway center field over the 435-foot marker.