Key three: Duke needs to stay out of foul trouble Duke is riding high after taking down No. 2 Michigan State 88-81 Tuesday in the Champions Classic. They will return to Cameron Indoor Stadium and face Southern on Friday. Here are the three keys to the game: Don't rush Bagley After Marvin Bagley III suffered an injury scare when Javin DeLaurier inadvertently poked him in the eye Tuesday against Michigan State, his status going forward is uncertain—although the indications are that it isn’t a serious injury. Nevertheless, Duke has no real need to rush their star forward into action. The Blue Devils need him 100 percent healthy by the time conference play rolls around, so there is no need for him to play against Southern on Friday if he isn’t fully ready. Stay out of foul trouble Although Duke managed to grit out a win against the Spartans, several of its top players were dangerously close to fouling out. With Bagley out, Wendell Carter Jr., DeLaurier and Gary Trent Jr. both played much of the second half with four fouls. Although Bagley’s return would certainly help with this, the Blue Devils will have to play much cleaner basketball going forward if they want to win the ACC regular season crown. Keep owning the glass Duke was historically good on the offensive glass Tuesday, grabbing 25 offensive rebounds for the first time since a 2014 win against Florida State. Against a physical Michigan State team, the Blue Devils outrebounded the Spartans 46-34 overall, including a 25-11 mark on offensive rebounds. Southern has a lot of uncertainty at guard, but has a star forward in Jared Sam, who 13.6 points and 7.4 rebounds per game last year. Duke will have to keep the 6-foot-10 senior in check on the glass in preparation for the meat of the schedule going forward.