Jody Davis drove in six runs with a grand slam and a two-run single to lead the Chicago Cubs to a 9-5 victory over the Expos yesterday in Montreal.

Davis' grand slam, the second of his three-year career--the first was June 12--came in the second inning off starter Randy Lerch (1-1) giving the Cubs a 4-0 lead. Leon Durham singled, Keith Moreland reached on an infield single, and Gary Woods walked. Davis hit the next pitch for his 12th homer.

"This was the biggest day of my career," said Davis. "This is my second grand slam in the last two weeks. That's something I can't really explain."

The Expos, who got a run in the second off starter Dickie Noles (1-3) when Bobby Ramos' infield out drove in Doug Flynn from third, made it 4-3 in the third on RBI doubles by Terry Francona and Warren Cromartie.

But Chicago got four runs in the fifth against reliever Chris Welsh. Ron Cey opened the inning with a double, Durham walked, and Moreland was hit by a pitch, loading the bases with none out. Woods singled, driving in a run, and Davis drove in two more with a single to center. Larry Bowa made it 8-3, scoring Woods from third with an infield out.

Moreland charged to the mound after Welsh hit him on the batting helmet with a 3-2 fast ball. He tackled Welsh around the knees, and the two players wrestled as both benches emptied. No one was injured, and Moreland was ejected.

Meanwhile, the Expos announced that Rodney Scott, the controversial second baseman they released a year ago, has been invited to work out with the club's Wichita Aeros Triple A farm team.