Maryland's lacrosse team encountered only one serious problem today as it defeated Navy for the sixth straight time, 17-12,. The Terrapins scored in such lightning bursts they did not allow their defense sufficient rest.

Only twice was Navy able to pull even, at 3-3 and 4-4 early in the second period. It took undefeated Maryland (6-0) seven seconds to snap the first deadlock, nine seconds to break the second.

"Our defense never got a chance to rest in the first half," said Maryland Coach Bud Beardmore. "They'd be down at our end for a minute and a half, then we'd go down and score in 10 seconds. It's nice to score quick, but if you're going to trade goals, then you ought to do it a little slower."

Part of the reason Maryland's defense spent so long an afternoon was Navy attackman Mike Buzzell, who scored six goals for a season total of 30.

In the first half, buzzell concentrated on setting up teammates, who rarely scored. In the second half, he took over himself and connected five times to keep the result in doubt until the last seven minutes.

"We were trying to do something a little different in the first half, to take advantage of their double-teaming Buzzell, and it didn't work," said Navy Coach Dick Szlasa. "It was frustrating, the number of shots we had and so few goals."

Navy (6-2) fired 60 shots to Maryland's 47, but 23 saves by Terrapin goalie Bryant Waters were a key factor in the Mids' inability to take the lead. It was Waters' second straight 23-save game.

Trailing 10-6 in the third period, Navy fought back on a pair of goals by Buzzell. After Bob Ott's score from the second-half faceoff made it 11-8, Buzzell hit again. Maryland's Bob Boneillo and Navy's Mike Hannan matched goals and it was 12-10 when the key play play of the game occurred.

Buzzell, on his knees, launched a remarkable shot that struck the pipe. Maryland grabbed the rebound and Boneillo scored on a fast break. Buzzell retaliated again on a brilliant individual effort, but three straight Maryland goals finally provided breathing space for the Terrapins.

Boneillo and John Lamon each recorded five assists for Maryland, which hosts top-ranked Johns Jopkins Saturday in a battle of unbeaten lacrosse powers. Although Maryland had a rough time today, Beardmore insisted it was because of Navy's excellence rather than a tendency to look ahead.

"We've been beating them regularly, but it's always close," Beardmore said. "We never blow them out. We know what Navy can do, what anybody can do if you sit down for a minute." CAPTION: Picture, Undefeated Terrapins Beat Navy, Maryland midfielder Klay Johnson whistles shot past Navy goalie Jeff Johnson for second-quarter score in traditional battle between area rivals. Terrapins won, 17-12. By Richard Darcev-The Washington Post