Clark committed to Illinois after a standout sophomore season at Windermere Prep in Orlando, Florida. During his sophomore season, he averaged 11.6 PPG, 6.6 RPG, 4.7 APG and 1.3 SPG, leading his team to a 20-8 record before losing in the FHSAA Class 3A regional semifinals to the eventual state champions. He played AAU for The Skill Factory this summer. His brother, Skyy Clark, will be a freshman at Illinois this fall. He is a strong, explosive guard.