Davis is from the South Side of Chicago and played high school basketball for Perspectives Charter School, where he had attended school since sixth grade. The team plays in a division of the Chicago Public High School League, known as the Blue Division, that is ignored by the media because of its lower level of competition. Perspectives is a charter school that operates as a math and science academy with high academic pedigree, but minimal athletic success. The school had no gymnasium and Davis' middle school basketball teams practiced at a nearby church. In junior high school, he was known as "the little guy who would shoot threes from the corner". He ended his freshman year at a height of 6 feet 0 inches (1. 83 m). By the beginning of his sophomore year, he had grown another 1 inch (2. 5 cm), and he finished the year at 6 feet 4 inches (1. 93 m).