Sydney McLaughlin broke the 400-meter hurdles world record

She broke her previous record of 51.14 from a month prior

She has lowered the world record from 52.16 to 50.68 

Sydney McLaughlin is nine tenths of a second faster than her native countrywoman Dalilah Muhammad 

Sydney McLaughlin win Gold Medal by breaking this world record

Sydney McLaughlin, 22, now holds the three highest honours in a single event: Olympic gold, world title 

McLaughlin overtook Usain Bolt as the second-youngest person to do the triple 

Sydney McLaughlin breaks 400m hurdles world record four times throughout the course of a lifetime 

Sydney McLaughlin best competitors moved to semifinals 

She told NBC Sports' Lewis Johnson, "We hoped we'd be able to run a little bit faster