Campbell hit .205 in his debut year at Cal. Derek slammed seven home runs and tallied 21 RBIs in his junior year at Mater Dei. He hit .340 on his way to being named the Monarchs Offensive Player of the Year. He was tabbed for First Team All-Trinity League honors. Derek also earned a spot on the second team all-county for his strong junior season. The year prior, the coaching staff rewarded Campbell's efforts with the glove by naming him the team's Defensive Player of the Year.