Collin Welp added 15 points for UC Irvine, which has won six in a row against Hawaii.
Welp made two free throws to give UCI (17-10, 9-2 Big West Conference) a 13-point lead with 2:26 to play but Drew Buggs and Justin Webster answered with back-to-back 3-pointers to spark a 10-0 run that made it 66-63 when Zigmars Raimo made a layup with 36 seconds left but Leonard and Worku each made a pair of foul shots to cap the scoring.
Buggs led Hawaii (14-10, 5-5) with 17 points and seven assists and Eddie Stansberry scored 10 points.
The Rainbow Warriors have lost their last four games.
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