Sydney McLaughlin, 2019 world silver medalist, wins her first-round 400m hurdles heat by nearly a second in 54.07, moving on to the semifinals as the prelims' fastest qualifier #NBCSports #SydneyMcLaughlin » Subscribe to NBC Sports: https://www.youtube.com/nbcsports?sub... » Watch Live Sports on NBCSports.com: http://www.nbcsports.com/live NBC Sports Group serves sports fans … [Read more...]