Mike Bossy and Bryan Trottier each had a goal and an assist to pace the New York Islanders to a 6-1 victory over the Toronto Maple Leafs in Toronto tonight, enabling the Islanders to sweep the best-of-five preliminary series in three games.

The defending Stanley Cup champions needed only a concerted 11-minute effort in the first period to settle the issue when they put five of their 14 shots past embattled Toronto goalie Jiri Crha.

Islander center Wayne Merrick began the rout at 8:51 when his wrist shot beat Crha on the glove side. Bossy, who had 10 points in the three-game series, gave New York a 2-0 lead with a 35-foot shot on a power play at 12:05.

Right wing Hector Marini made it 3-0 1:52 later when he tipped defenseman Ken Morrow's shot from the point under Crha's outstretched right leg. With Leaf defenseman Ian Turnbull serving an interference penalty, Mike McEwen scored his second goal of the series at 17:40 when his 45-foot shot deflected under the Toronto crossbar off Borje Salming.

With 25 seconds remaining in the opening period, Clark Gillies and Bill Carroll worked a two-on-one, with Gillies beating Crha for his second goal of the series and a 5-0 first period lead.