Griffin had a distinguished high school career at Oklahoma Christian School, winning state titles each of his four years under his dad, Tommy Griffin, who had been the head coach. Griffin left school after two seasons to enter the 2009 NBA Draft; he was chosen first overall by the Clippers. In his first season, he broke his left kneecap through the last preseason match, had surgery, and missed the whole 2009–10 season. He made his NBA debut as a rookie the next season, where he was chosen as an All Star, won the 2011 NBA Slam Dunk Competition, and was named the NBA Rookie of the Year. In 2011, “Sports Illustrated” called him one of the NBA’s 15 Best Rookies Ever.