17-year-old Olympic track hopeful Erriyon Knightonbroke Usain Bolt’s Under 18 200-meter record on Monday night at an American Track League meet in Jacksonville, Florida. Knighton finished 20.11 seconds, 0.2 seconds faster than Bolt’s 2003 record of 20.13. The Florida native, who turned 17 in January, decided to be a professional athlete when he was a...