Nolan Ryan pitched a four-hitter and struck out 10 in winning his first game in Dodger Stadium as the Houston Astros defeated Los Angeles, 3-0, yesterday.

In pitching the 48th shutout of his career and his first this season, Ryan (8-8) was aided by four double plays and was in trouble only in the fourth inning. With one out, Dusty Baker and Ron Cey singled and both advanced on a balk. Ryan struck out Jorge Orta and Steve Garvey to end the threat.

Ryan, winning for the first time in seven career decisions in Los Angeles, walked two and hit a batter. Loser Jerry Reuss (9-6) allowed three runs on seven hits and struck out seven in eight innings.

"I was aware I'd never won here before, but I have pitched some good games here," said Ryan, who extended his major league record to 140 for 10 or more strikeouts in a game.

"I knew I was out there no matter what," he said. "I still had good stuff, but against the Dodgers you can never feel too comfortable. You can't relax. Not with their kind of lineup."

Houston got the only run Ryan needed in the second inning. With one out, Phil Garner singled, moved to second on a balk and scored on Art Howe's single to center.