Connor Thornberry, 15, perfected a smooth throw when he began as a rookie cornhole player two years ago. Then came his signature black Stetson, a birthday gift in September, and his competitor's title: Connor the Cornhole Cowboy. His mostly adult competitors describe Thornberry as a tough opponent in the popular bag-tossing game that's taken off as a sport, including ESPN coverage. Thornberry is now advanced level, with eyes on turning pro. He's set to compete in the American Cornhole League World Championships.