Add all his exploits together, and Harper is doing something no teenager ever has in the major leagues. After his second consecutive three-hit game, Harper is batting .307 with a .943 on-base plus slugging percentage. Over a full season, his OPS would surpass the highest mark by a teenager — Mel Ott’s .921 in 1928 — since at least 1900
“I just feel really good up there,” Harper said. “At the beginning, I usually struggle. Once I get going, it’s scary.