Vermont (11-6, 1-1 America East) led 32-20 with 4:09 before halftime before the Retrievers (7-11, 0-3) went on a 14-3 run that continued 58 seconds into the second half.
Later, Duncan hit a 3, Isaiah Powell followed with a jumper and the lead went to 56-42 with 11:25 to play and Vermont was never challenged again.
Lamb scored 12 and Shungu scored 11.
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Northwestern hopes to challenge No. 7 Maryland again
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