Navy pounded out 13 hits, two grand-slam home runs, and took advantage of the Maryland pitchers' wildness yesterday for a 13-9 baseball victory at Shipley Field in College Park.

The Mids, now 14-6, sent up 23 batters in the first three innings and scored 12 runs. Six men were walked.

Terp starter Scott Venturelli, who lost his fourth of six decisions, lasted only one-third inning. He walked three of the first six batters and gave up two singles. Mark Haynes relieved with the bases loaded, one out, and the score 3-0.

Haynes struck out George Peotro before walking Terry Dietz to score the fourth run. He then worked first baseman Bob Ravener to a full counnt before Ravener hit a fast ball over the right-field fence for a 7-0 lead. It was the first homer of the season for Ravener, who entered the game with only five runs batted in.

Maryland got three runs on three singles, a passed ball and center fielder Mark Poehlman's solo homer in the bottom oe the first. But catcher Jim McKee's homer in the second gave Navy an 8-3 margin.

The Mids had dropped three of their last four games bacause of "getting ourselves out, swinging at dumb pitches," said Coach Joe Duff.

But in the top of the third yesterday the visitors allowed Maryland (11-19-1) to beat itself.

A Navy single and stolen base, a walk and a hit batter, interrupted by one out, loaded the bases. Then short-stop Mike Mullikin leaned into Haynes' first pitch to him and ripped a grand-slam over the center-field fence to make it 12-3