Jahmir Young led Maryland (1-2) with 14 points. Harris-Smith and Donta Scott added 13 apiece. The Terps lost to Davidson, 64-61, in the tournament opener Friday.
The Blazers (1-2) held on despite missing their last six shots and committing three turnovers in the last six-plus minutes. They made 7 of 8 free throws in that stretch, the last by Gaines with 9.8 seconds left.
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Alejandro Vasquez scored 14 points for the Blazers, who lost to Clemson, 77-76, in the opener.
The Terps led 30-24 at halftime, but the Blazers scored the first six points of the second half to tie it.