Clark Academy, which won its fourth Section 1 title since 2007 last Friday, trailed Shelter Island led 20-11 after one quarter and 36-21 at the halftime and never got closer than 20-17 early in the second quarter.
Calvin Walters and Andre Carthorn each scored eight points and Clatyon Buckner and Rahmel Lowden added six points for Clark Academy.
Shelter Island, a Long Island representative, advanced to play in the regional final at SUNY New Paltz Saturday, the final step before advancing to the state final four at Glens Falls.
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