John Demas was a talented standout in both baseball and football during his amatuer sports career. Unfortunately, he was sidelined several times during his middle school and high school years due to injuries. In 2012, John underwent ulnar nerve transposition on his throwing arm. In 2013, he had to have a procedure to remove scar tissue. Then, in 2015, a procedure was required to remove bone chips and microfracture to encourage the development of fibrocartilage. After a difficult recovery, John made the varsity baseball team at Charlotte Country Day as a freshman , but had to have another surgery and was unable to play. Despite all of these setbacks, John played baseball sophomore through senior year (2016-2019) as a primary catcher and first baseman. He was also named Captain of the State Champion football team and nominated as Charlotte Linebacker of the Year his senior year.