John Lowenstein supported Mike Flanagan's seven-hitter with his 11th homer of the season last night as the Baltimore Orioles beat the Minnesota Twins, 3-1, in Minneapolis.

Flanagan (4-4) struck out six and walked one while pitching his third complete game.

Flanagan won his 10th straight game from the Twins. "I guess I'm in that--quote-unquote--groove," he said. "He's pitching outstanding baseball," Oriole Manager Earl Weaver said. "Tonight he had a great fastball, and his curve was even better."

The Orioles gave Flanagan a 1-0 lead in the first. Al Bumbry led off with a walk, took third on Rich Dauer's single and scored on Eddie Murray's fly ball.

Lowenstein, leading off the fourth inning against loser Al Williams (2-3), produced the ultimate winning run with his homer.

The Twins cut the gap to one in the seventh. Tom Brunansky, leading off, singled and, one out later, scored on Jesus Vega's single. The Twins loaded the bases on Mickey Hatcher's single and a walk to Gary Gaetti but Flanagan got Sal Butera on a grounder.

In the eighth, Dan Ford's fly ball scored Dauer, who had led off with a single and moved to third on Ken Singleton's double.