Kenyon Lee Martin Jr. was born on January 6, 2001 in Los Angeles, California. The son of former NBA player Kenyon Martin -- the No. 1 overall pick in the 2000 NBA Draft -- Kenyon Jr. attended two high schools in the Los Angeles area before spending one post-graduate year at IMG Academy in Bradenton, Florida. Martin began his high school career at Chaminade College Prep before transferring to Sierra Canyon, where he teamed with Scotty Pippen Jr. and fellow 2020 NBA draftee Cassius Stanley. Initially, Martin committed to play college basketball at Vanderbilt University, but he ultimately opted to spend a post-graduate year at IMG Academy. At IMG, Martin averaged 20.0 points and 8.0 rebounds per game. He scored 37 points during the National Prep Showcase and declared for the NBA Draft in March of 2020.