Isaac Okoro scored 19 points, Samir Doughty scored 18 and No. 16 Auburn held off Iowa State 80-76 in the opening game of the Big 12/SEC Challenge. The Tigers improved to 17-2. Auburn led by 14 points with under six minutes left before the Cyclones rallied. Rasir Bolton had 23 points for Iowa State, which fell to 9-10.