JT (Jason Thomas) Schwartz was a four-year letter winner in baseball and two-year letter winner in basketball at Corona del Mar High School in Newport Beach, California. He was named to various honorary teams during his time there, and thanks to his cumulative .326/.455/.573 batting line over the court of his time there, Schwartz was considered one of the better prep players available in the 2018 MLB Draft from the state of California. In the end, despite hitting .459/.520/.729 in his junior year and .326/.458/.697 with 11 combined home runs, he went undrafted, owing to his extremely strong commitment to the University of California, Los Angeles.