Last night, at the LSU Invitational in Baton Rouge, Louisiana, 18-year-old Erriyon Knighton won the 200 meters in 19.49.
Thus, he lowered his own junior world record, which was previously more than half a second slower: 20.00.
The race is the eighth fastest time in history.
In fact, only three runners ran faster: Usain Bolt, Yohan Blake and Michael Johnson.
Bolt's world record is 19.19.