Mark Tetzlaff scored 32 points to lead South Dakota State to a 78-71 victory over Mount St. Mary's tonight in the semifinals of the NCAA Division II men's basketball tournament.

In Saturday's title game, South Dakota State (26-6) will play Jacksonville (Ala.) State (29-1), a 76-61 winner over Kentucky Wesleyan..

While Tetzlaff, a 6-foot-7 senior center, was ruling inside, Mount St. Mary's (28-5) made only 41.3 percent of its shots. South Dakota State hit 55.6 percent.

The Mountaineers fell behind, 16-8, but took an 18-16 lead behind four points from substitute Rusty Rauh. The Jackrabbits came back with six straight points and led at the half, 30-27.

Mount Saint Mary's opened the second half with eight straight points to take a 35-30 lead, but did not take advantage of several chances to extend that lead.

"I thought we were going to blow them out at the start of the second period," said Mountaineers Coach Jim Phelan.

South Dakota took its first lead since the start of the second half on a basket by Mark Schultz to make it 48-47 at the 9:49 mark. The Jackrabbits sealed the victory by making 10 of 13 from the foul line in the last two minutes.

Of Tetzlaff, Phelan said, "He is tougher than I thought. He does a lot with his quickness and that turnaround shot."

For South Dakota, Bob Ladoceur had 15 points and Schultz and Tom McDonald 12 each.

Mount Saint Mary's was led by the Edwards brothers, Darryle with 16 points, and Paul with 14.