Cougars coach Darin Raasch estimated that his team trailed for three-quarters of Tuesday's road game, but it did just enough to remain unbeaten.
Z-M trailed 22-19 at half and it didn't take the lead until there was six minutes to play in the game.
"We were able to string together a couple of good defensive stops and (show) a little more patience on the offensive end," Raasch said.
Defense has been a priority with this season's team.
"(We) have high goals," Raasch said. "We realize that the offense is going to come, but we have to be able to play good defense. ... A significant portion of every practice is based on defense."
Cody Lodermeier led Z-M with 22 points and eight rebounds. He finished 7-for-15 from the field.
"They weren't bunny layups," Raasch said. "He was having to hit over the top of 6-5 guys in his face. You could tell he's been a four-year starter. He decided he was going to make some shots tonight."
Z-M (4-0) plays host Friday to Kasson-Mantorville.