SAN FRANCISCO (AP) _ Rookie right-hander Kevin Coffman was just wild enough to be effective in a 6-4 victory over the division champion San Francisco Giants Friday night.

Coffman, facing the Giants for the first time in his career, yielded only three hits and one run in six innings, keeping batters loose with erratic control that contributed to six walks. One pitch sailed behind Bob Brenly's head.

''The kid (Coffman) has a live arm,'' Giants Manager Roger Craig said. ''He has a sinker like Roger McDowell's, and he throws hard. He's just wild enough to be good.''

Coffman 2-3, said his wildness is nothing new.

''That's my normal style,'' he said. ''Hitters don't dig in on me, especially right-handers. I like to throw my fastball inside, and tonight the ball was slippery.''

Rookie shorstop Jeff Blauser had three singles, scored twice, knocked in two runs and stole home on the front end of a delayed double steal in the third, giving the Braves a 1-0 lead off Dave Dravecky, 10-12.

Pinch-hitter Francisco Melendez led off the sixth with a homer for the Giants, their 11th pinch-hit homer of the season, one short of the major- league record by the 1957 Reds and 1983 Mets.

Singles by Dale Murphy and Ozzie Virgil around a hit batter by Dravecky loaded the bases in the fourth, and Blauser's two-out single made it 3-0.

The Braves added an unearned run in the fifth and scored twice in the sixth on a run-scoring grounder by pinch-hitter Graig Nettles and an RBI single by Hall.

Rick Mahler replaced Coffman in the seventh and gave up a run on Candy Maldonado's single. The Giants scored two more runs in the eighth on an RBI single by Randy Kutcher and a run-scoring double by Mike Aldrete before Jim Acker came in to get the last five outs for his 14th save.

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