MILWAUKEE — Ole Miss probably can’t afford another late letdown when the sixth-seeded Rebels face third-seeded Iowa State in the second round of the NCAA Tournament’s South Region on Sunday evening.Ole Miss (23-11) staved off a furious rally by 11th-seeded North Carolina — which cut a 22-point deficit to two points with just over a minute to go — and held on for a 71-64 first-round victory Friday.Iowa State (25-9) gained control midway through the first half against 14th-seeded Lipscomb and rolled to an 82-55 victory in the first round Friday.”I know this — one of the best teams in college basketball, period,” Ole Miss coach Chris Beard said of Iowa State. “Defensive identity, really good coach, and a lot of talented players that we’ve been following for years.”Iowa State shot 58.3 percent from the field against Lipscomb, hitting 35 of 60 shots, and dominated inside with a 50-20 advantage in points in the paint. The Cyclones also had a 35-23 rebounding edge.Sophomore forward Milan Momcilovic, who led nearby Pewaukee (Wis.) High School to three consecutive state championships, had 20 points, hitting 4 of 8 attempts from 3-point range.The Cyclones are without starting guard Keshon Gilbert, their second-leading scorer (13.4 points per game), who was declared out for the entire tournament with a groin injury.Curtis Jones, who had 17 points vs. Lipscomb, averages a team-high 17.1 ppg. Joshua Jefferson adds 12.9 ppg and a team-high 7.4 rebounds. Momcilovic averages 11.7 ppg and Tamin Lipsey 10.8.Iowa State trailed 16-15 against Lipscomb, then went on a 14-0 run to take control.”That was extremely important because when you’re playing on this stage against a really good team, when they get confidence, they continue to build confidence,” said Iowa State coach T.J. Otzelberger. “And Milan did a terrific job, and his teammates did a terrific job during that stretch, making sure we got back out in front.”