"We're an aggressive ball club," Yardling coach Kenneth Klug said yesterday, and the freshman baseball nine supported that statement by smashing four home runs against M.I.T. on Tuesday for an 18-1 victory and walloping Boston University yesterday at Soldiers' Field 12-5.

In the season opener with the Engineers, John Lund allowed only two hits in six innings of pitching. With a shortage of experienced relief pitchers, coach Klug put shortstop Art Serrano on the mound to complete the game.

Lead-off hitter Vince McGugan homered twice and drove across three runs. Not to be outdone, catcher John Murray also had a four-bagger and scored three times while centerfielder Havard Lee tripled twice, brought in three men, and scored three more runs himself.

Despite terribly cold weather, the Yardlings exploded early in the game for a 13-0 lead through three innings. Dave Ignacio's three-run homer in the third triggered a nine-run rally that brought thirteen batters to the plate.

Starting pitcher Jerry Fruetel yesterday had little trouble disposing of the B.U. Terriers. In a six-inning exhibition of perfect control, Fruetel struck out eight, walked none, and nearly shut out the Terriers.

The only run was an unearned score with two out in the fourth. Fruetel appeared to have the third out, but catcher Murray dropped a called third strike, allowing B.U. a runner. The Terriers' donavan then smashed a terrific blast to left field that scored the run, but Donavan was cut down at third with a perfect throw from left field by Paul Zevnick.

As against M.I.T. the day before, Harvard once again jumped to an early lead with six runs in the second, two driven in by captain Tim Bilodeau. Leftfielder Zevnick had three more RBI's and Ignacio scored twice in the game.

Right-hander George Crace will start the Yardlings' next match at the University of New Hampshire at 2:30 p.m. on Saturday. Crace is an excellent control pitcher and is the most experienced hurler on Klug's young mound staff.