With his third world 200-meter championship on Friday, American Noah Lyles made history by becoming the first male sprinter since Usain Bolt in 2015 to complete the sprint double at the World Athletics Championships.
Last weekend's 100-meter gold medalist Lyles ran the fastest time, clocking 19.52 seconds, teenage teammate Erriyon Knighton came second in 19.75 seconds.
20 year old Letsile Tebogo from Botswana won the bronze medal in 19.81 seconds to go with his silver from the 100-meter race.
Lyles follows in the footsteps of the now-retired Jamaican sprinting legend Bolt, who at these championships in 2009, 2013 and 2015 successfully achieved the sprint double three times.
After Bolt, the American quartet of Tyson Gay in 2007, Justin Gatlin in 2005, and Maurice Greene in 1999, he is the fifth man to win the 100 and 200 meter world championships.
Lyles is the third-fastest man in history with a 200-meter best time of 19.31 seconds, but he is still well behind Usain Bolt's 2009 world record of 19.19 seconds.
He had stated before the competition that he intended to beat Bolt's record, but despite a thrilling start at the National Athletics Centre and a brilliant home stretch, the record was never in jeopardy.
After his astonishing win in the 100 meters, Lyles had also sworn that he would pursue a golden treble as the "start of a dynasty" and promised to do so.
The US four had already qualified for the 4x100m relay final on Saturday, taking first place in their heat in a time that set a record for the world (37.28) and giving Lyles a chance to win a third gold medal should he be selected for the final quartet.
Zharnel Hughes of the United Kingdom, who took home the medal in the 100 meters, came in fourth in 20.02 seconds, barely ahead of Kenny Bednarek of the United States (20.07).
Andre de Grasse of Canada, the current Olympic champion, finished sixth in 20.14, slightly ahead of Alexander Ogando of the Dominican Republic.