Stefan Vossenkuhl scored 19 points and Josh Mansur added 16 as the Spudders fended off Seton.
Seton Catholic jumped out to an 11-2 lead before Ridgefield rallied to take a 38-26 halftime edge.
The Spudders stretched their lead to 18 in the third quarter before Seton rallied back to cut it to as little as seven points in the final quarter.
“Seton showed a lot of fight,” Ridgefield coach Jason Buffum said. “It was a really good preseason game.”
Gabe Anderson led Seton with 17 points and Xavian Rushing added 16.
RIDGEFIELD 68, SETON CATHOLIC 57
SETON CATHOLIC (0-2) — Na’ol Abu 0, Eba Abu 8, Kellen Ball 6, Jacob Geroge 0, Luke Pitzer 4, Gabe Anderson 17, Xavian Rushing 16, Andrew Olson 6, Zach Cowger 0, Griffin Young 0. Totals 20 (3) 14-23 57.