DonAndre Clark was a three-sport athlete at Junipero Serra High School in San Mateo, CA, lettering in baseball, football and track and field. A two-year letter-winner in baseball, Clark posted a .306 batting average in 2009, while hitting .286 in mere seven games in an injury-shortened season in 2010. He was ranked No. 32 in Northern California for baseball before the 2010 season. He was a two-time All-WCAL selection in football and garnered all-league honors in track like a junior.