Sanders missed his first eight shots from the field, then hit four straight 3-pointers to give Idaho a 55-39 lead with 8:42 to play. The Vandals would extends their lead to 20 points, but Troy's 17-2 run cut its deficit to five with 15.6 seconds to go.
Arkadiy Mkrtychyan made 1 of 2 free throws in the final seconds to seal it.
Mkrtychyan finished with 10 points for Idaho (4-1). Sanders was 4 of 14 from the field.