A small group of spectators crowded onto the one bleacher at the Washington Squash Racquets Club yesterday and watched Mike Desaulniers of New York City easily defeat Mario Sanchez of Mexico City, 15-10, 15-6, 15-3, in the final of the $15,000 Wurzburger Open tournament.

Sanchez, 26, never was able to take even a one-point lead in the 45-minute match watched by 125. The closest he came was 2-2 in the third game before Desaulniers, using a particularly effective spin shot off the side wall, ran off 10 straight points to end any doubt.

Before the finals, Sanchez casually looked over the poster-board replicas of the first- and second-place checks ($2,850 and $1,710) and said, "I'll take either one."

Sanchez said before the match that he thought he could win because, "I have better physical condition. The last few times I've played him (Desaulniers), he's gotten tired."

Not this time.

At the end of the match, Sanchez, ranked sixth in the world, had a different comment. "I was tired," he said. "All my other matches (three in two days) went to five games."

Desaulniers, ranked second in the world, agreed. "I had an easy time," he said. "His (Sanchez's) half of the draw had the best players. He played like he was sluggish."

Desaulniers, who defeated the legendary Sharif Khan in four tournament events last season, is expected to be ranked No. 1 by the World Professional Squash Association when the new rankings come out next week. As a student at Harvard, he did not lose a collegiate match in four years. He is now a commodity trader in New York City.