Pitcher Tim Conroy, who'd never had a major-league hit, doubled home two runs in a five-run seventh inning, then singled two more home the next inning to enable the St. Louis Cardinals to rout the San Diego Padres, 13-3, yesterday in St. Louis.

And by pitching a five-hitter he became the Cardinals' only starter since opening day to finish a game. He gave up only a single after the third inning.

"Once we had that big inning," he said, "I just threw fastballs and let them swing away."

He couldn't remember the last time he had two hits in a game. "I think it was at Gateway High School in Monroeville, Pa.," he said.

The Cardinals had a season-high 20 hits in winning consecutive games for the first time since April 18-19.

Jose Oquendo, who played second base for the Cardinals, had three hits to raise his average to .615.

*Pirates 8, Giants 2: Mike Bielecki and Jim Winn pitched a four-hitter in Pittsburgh and teammate Sid Bream drove in three runs with a double and a single.

Bielecki (3-0) had worked 15 straight scoreless innings until Joel Youngblood and Will Clark homered for San Francisco in the eighth. Winn got the last five outs without allowing a hit. Johnny Ray, who singled in the first inning, has hit safely in all but one of the Pirates' games.

*Braves 10, Reds 5: In Cincinnati, Dale Murphy's two home runs and five RBI cost the Reds their 10th loss in 11 games.

He homered with two on in the first inning, then Bob Horner homered, too, to give the Braves a four-run lead against John Denny (1-4).

First baseman Horner left the game after hurting his right wrist diving for a ball in the first inning. He isn't expected to miss a game but it's the same wrist he has broken twice.

*Cubs 6, Dodgers 5: Shawon Dunston led off a four-run fifth inning with a homer into a 22-mph wind against Jerry Reuss (2-1) in Chicago. His five homers lead the Cubs but he wishes a teammate had more.

"That's not my stat," he said. "That's not what I want to do. I wanted to bunt to get on." He said he swung away when the infield drew in.

"I didn't think it would go," said Reuss. "But it was a line drive. A fly ball wouldn't make it." Teammate Mike Marshall proved that in the ninth when he flied deep to left field. Pirates Waive Kemp

The Pittsburgh Pirates today put outfielder Steve Kemp, 31, on waivers and, if he is unclaimed, will release him. He has one of baseball's biggest contracts and is hitting .188.

The team replaced him with Trench Davis, a .400 hitter in Class AAA Hawaii, and recalled pitcher Jose DeLeon to replace Bob Patterson, who went to Hawaii.