Playing a slow, steady game, Mark Rose from the Rochester University varsity upset Pedro Rosello, ninth ranked player in the U.S. and first seeded in the Summer School tournament, in Friday's semi-final match, 8-6, 6-3. In the final he will face the winner of today's semi-final match between Richard Abramson and Marsh McCall. The final will be held at 1 p.m. tomorrow on the varsity courts.

Abramson, number four on the U.C.L.A. varsity, and McCall, a Summer School instructor, take the court in their semi-final game at 6 p.m. this evening.

In the men's doubles final, Jim Wallach and Abramson will face a team of Bob Stein and Dave Crane, a Harvard-Yale combination, immediately following the singles final tomorrow. Wallach and Abramson knocked off Walter Moore and Rose in a tight semi-final match, 6-2, 5-7, 7-5. Stein and Crane won easily in the semi-finals, 6-2, 6-1 over professor C. A. Trypanis and Bob Schrader.