Purdue shot only 39 percent in the first half and trails No. 13 seed Siena, 32-29, at halftime.
The Boilermakers are struggling to make open shots, both on the perimeter and at the basket.
First-team all-conference players JaJuan Johnson and E'Twaun Moore are a combined 7 for 18. Keaton Grant has missed all four of his shots, all three-pointers.
Most of Johnson's misses have been near the basket, but they're not falling. Moore had at least three shots near the rim that bounced out.
That can't continue in the second half if Purdue wants to stay in Spokane.
Moore has 10 points and four rebounds. Johnson has eight points and five rebounds.
Siena also is shooting only 38 percent and holds a 21-19 rebounding edge. Alex Franklin has 10 points and eight rebounds, and Ryan Rossiter has seven rebounds.
Point guard Ronald Moore has three assists and one turnover.
Purdue has done a pretty good job against Siena's full-court pressure defense, though freshman Kelsey Barlow has two careless turnovers. Not sure how much we'll see him in the second half. It could depend on how Lewis Jackson feels. So far, he's looked OK, playing 12 first-half minutes. He did appear to get stepped on at one point in the half and came out of the game. But he went back in.
Siena's Clarence Jackson hasn't played with an ankle injury. He averages 13 points per game.