Mike Flanagan and Sammy Stewart combined on a six-hiter and Gary Roenicke drove in three runs to lead the Baltimore Orioles to a 6-0 victory over the A's last night in Oakland.

The Orioles scored five runs in the sixth, only two of which were earned, as a result of three errors. Roenicke drove in two runs with a bases-loaded single and Cal Ripken Jr. and Rich Dauer each had an RBI.

Flanagan (3-0) worked the first five innings and gave up four hits. It was his ninth victory over Oakland without a loss and his 13th against four losses overall against the A's.

Stewart piched the final four innings for his first save. Starter Bill Krueger (2-2) gave up all six Baltimore hits in 5 1/3 innings.

Two throwing errors by shortstop Tony Phillips set up Baltimore's sixth-inning rally. Rick Dempsey singled and went to second when Phillips threw wild to first. Phillips threw wide of first on a roller by John Shelby and Dan Ford's bunt single loaded the bases. A single by Ripken scored one run, and after Eddie Murray hit into a force out, Roenicke singled in two more runs.

A walk to Ken Singleton loaded the bases again. The final two runs scored when Rich Dauer's smash to third went through Carney Lansford's legs for the third error.