The Philadelphia Phillies rallied for two seventh-inning runs on pinch hitter Sixto Lezcano's line drive single and right fielder Dave Parker's error to beat the Pirates, 5-3, yesterday in Pittsburgh.

The Phillies stayed a half-game behind NL East-leading Montreal; the Pirates dropped two games back.

With the score tied at 3, Greg Gross and Mike Schmidt singled with one out in the seventh off Pirates reliever Cecilio Guante. Rod Scurry then replaced Guante and promptly gave up Lezcano's single, scoring pinch runner Bob Dernier. When Parker misplayed the ball in right field, Schmidt scored from first.

Shortly after Parker's error, a fan threw a small battery at the right fielder, but missed him.

Parker remained in the game, unlike a similar incident in 1980, when he left a game against Los Angeles when a battery was thrown at him from the stands.

"I only have 19, 20 more days on my contract here and no one is going to intimidate me out there," Parker said. "I thought it was a practical joke, someone trying to repeat what happened before."

"People like that shouldn't be allowed in the ballpark," Pirates Manager Chuck Tanner said. "Dave came off the field and said, 'I play hard. They're not going to chase me out of there.' I don't care so much about the loss as I did that incident. That took the steam out of it for me.

"It just wiped me right out. Same thing with the guys on the bench . . .

"There we are fighting for a pennant, playing our butts off and some jerk has to pull . . . that."