EUGENE — Malcolm Armstead scored a career-high 23 points to help Oregon hold off Idaho State 77-71 on Tuesday night.

EUGENE — Malcolm Armstead scored a career-high 23 points to help Oregon hold off Idaho State 77-71 on Tuesday night.

Armstead, a sophomore making his seventh straight start in place of injured point guard Tajuan Porter, was 9-of-14 from the field and 5-of-6 from 3-point range. He also added three assists and three steals for the Ducks (7-4).

Former South Medford standout E.J. Singler scored 11 points on 3 of 6 shooting and had seven rebounds for Oregon.

Idaho State (2-10) got as close as 64-61 with 5:46 remaining, but Armstead assisted on back-to-back baskets by Jamil Wilson and Michael Dunigan, then drilled a pull-up 3-pointer and a floater in the lane to give Oregon a 74-68 lead with less than two minutes to play.

Oregon closed a back-and-forth first half on an 8-2 run. Armstead hit a 3-pointer with 25 seconds left, then followed with a coast-to-coast layup at the buzzer to give the Ducks a 36-33 lead at the break.

The Ducks had built a 12-point lead early in the first half, sparked by five straight points from Armstead, but Idaho State shot its way back into the game behind guard Broderick Gilchrest.