A throwing error by third baseman Johnny Bench on Manny Trillo's grounder with two out in the 15th inning gave the Philadelphia Phillies a 5-4 victory over the Cincinnati Reds last night in Philadelphia. Three players were ejected after a bench-clearing brawl in the seventh inning.

Bob Dernier led off the 15th with a single off loser Bob Shirley (2-3) and Pete Rose sacrificed him to second. After Mike Schmidt was walked intentionally, Dernier moved to third on Gary Matthews' fly ball. Trillo hit a grounder to Bench, whose low throw bounced past first baseman Dan Driessen.

Sid Monge (2-0), the seventh Philadelphia pitcher, went the final 1 1/3 innings and earned the victory.

The brawl occurred when Phillies' reliever Ron Reed hit Mario Soto with a pitch after Soto, the Reds' starter, had hit Schmidt and Dernier with pitches. Soto, Reed and Cincinnati shortstop Dave Concepcion were ejected from the game by plate umpire Harry Wendlestedt.

"I decided I was going to get him (Soto) while sitting in the dugout," admitted Reed. "There is a time when retaliation is needed. I respect my teammates and I want them to respect me. When he hit Bobby Dernier I decided to retaliate."

"It was an easy decision," said Wendlestedt. "Soto started out to the mound with his bat, and Reed and Concepcion were fighting. We just did not want any more fighting."