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 the Blue Division of the Chicago Public High School League, which 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; it has a strong academic reputation, 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).