Steve Yeager says the second-most important thing he does for the Los Angeles Dodgers is help the team's offense.

"I think my primary job is handling the pitching staff and positioning the defense," said Yeager, the Dodgers' catcher. "When I do that, I think I've contributed to the success of the ball club."

Yeager contributed to the success of the Dodgers in a different way last night in St. Louis by hitting a pair of two-run homers in the Dodgers' 9-4 victory over the Cardinals. Yeager's second home run, his 15th of the season, came in a five-run seventh inning that had ended a 4-4 tie.

Bob Forsch retired the first two Los Angeles batters in the seventh before Dusty Baker doubled into the left field corner and Forsch (6-8) was relieved by Jeff Lahti. Pedro Guerrero then had a check-swing double to right to drive in Baker and end the tie.

After Rick Monday was intentionally walked and Darrell Porter allowed a pass ball, Mike Marshall had a two-run single and Yeager followed by hitting the first pitch to him from Lahti over the left field wall, completing his second two-homer game of the season and fifth of his career.

Bob Welch (8-9) gave up 13 hits over 8 1/3 innings for the victory.

St. Louis Manager Whitey Herzog was upset by the two home runs but said the key hit in the game was probably Guerrero's double into short right field.

"Lahti made a heck of a pitch, but Guerrero hit it just down the line," Herzog said. "All heck broke loose after that. We're really having trouble keeping the ball in the park."