In March 2018, Dosunmu was named one of 26 high school seniors who participated in the Jordan Brand Classic on April 8, 2018, at the Barclays Center in Brooklyn, New York. Dosunmu is the third Illini to be selected to play in the Jordan Classic, joining Dee Brown who played for the Red team in 2002 and Jalen Coleman-Lands who played in 2015. Dosunmu was also selected to play in the second annual Iverson Roundball Classic All-American Game in April 2018 at Souderton Area High School outside of Philadelphia, Pennsylvania. During his senior season, Dosunmu averaged 25.2 points, 7.4 rebounds, 7.3 assists and 2.7 steals, leading Morgan Park to a second-straight IHSA Class 3A championship. Dosunmu was also named a Consensus first-team All-State selection by the Associated Press, Chicago Tribune, Chicago Sun-Times, Champaign News-Gazette and Illinois Basketball Coaches Association (IBCA) following his senior season.
