Catholic won the second half, which enabled the Crusaders to pull out a hard-fought, 41-39 victory that lifted their home record to 4-1 this season.
Zion dominated the first half, gaining a 12-7 edge at the end of the first quarter and then outscoring the Crusaders, 16-10 in the second period to build a 28-17 halftime lead.
But, the Crusaders took command in the second half, limiting Zion to just 11 points in the third and fourth quarters combined, while the Crusaders scored 24.
Catholic dominated the third quarter with a 10-2 advantage and shaved the deficit to 30-27 going into the fourth quarter. The Crusaders then outscored Zion, 14-9 in the final eight minutes.
The Crusaders led, 39-37 with 6.9 seconds left but fouled Andrew Leep on a 3-point attempt, and he made two of the shots to tie the game.
Gustin pushed the ball following the inbounds, drew a bonus foul and went to the line to sink the game winning shots.
“It was a complete turnaround in the second half,” said Crusaders coach Rob Recknagel. “Chase (Willer) was incredible tonight. He gave us the spark we needed to get over the top.
“He never stopped working this season, despite spotty playing time, and his now playing his best basketball down the stretch when it matters most.”
Willer made his first career start and came up big for the Crusaders with 12 points and five offensive rebounds. Braden Gustin scored 10 points, including eight points in the fourth quarter.
The Crusaders lifted their record to 5-11 overall, and will host Western Michigan Christian on Friday.