Ron Oester drove in three runs to help Tom Seaver win his first game since May 4 as the Cincinnati Reds defeated the New York Mets, 8-3, last night in Cincinnati.

Oester's two-run single in the fourth broke a 2-2 tie and put the Reds ahead to stay. Dave Concepcion drove in two more runs in the sixth with a single.

Met outfielder George Foster, playing his first game in Riverfront Stadium since being traded by the Reds, got three hits, including a first-inning homer.

The Reds got a season-high 17 hits, four of them by Dan Driessen, to make it easy for Seaver (2-6). He went seven innings, giving up eight hits and striking out six.

"I'm very satisfied with the way I threw," he said. "I made some bad pitches, but I made a great majority of good pitches, too."

The Reds announced that the league had fined Concepcion $300, pitcher Mario Soto $300 and outfielder Paul Householder $200 for fighting with the Phillies last Monday.

Pitcher Ron Reed of the Phillies hit Soto with a pitch, starting a bench-clearing brawl. Earlier, Soto had hit two Phillies. The league announced Reed's fine earlier.