DES MOINES, Iowa (AP) Ricky Council IV scored 18 points and Arkansas survived some anxious moments in the second half against an Illinois team that wouldn't go away, holding on to beat the Illini 73-63 in the first round of the NCAA Tournament on Thursday.

Devo Davis had 16 points for the eighth-seeded Razorbacks, who used relentless defense and rebounding to build big leads but couldn't get comfortable until the final minute. Arkansas (21-13) faces top-seeded Kansas on Saturday in the second round of the West Region.

Terrence Shannon Jr., held scoreless the first 16 minutes, finished with 20 points to lead the Illini (20-13). It was the first time in five tournament appearances since 2011 that Illinois didn't make it out of the first round.