The 28-year chase for a world record

American Kevin Young's record of 46.78 seconds is the longest-standing record in men's track running, but now it's come under threat. Two-time world 400m hurdling champion Karsten Warholm came within 0.09 seconds in August 2020.

source https://www.cnn.com/videos/sports/2020/10/20/karsten-warholm-400m-hurdles-kevin-young-world-record-athletics-lon-orig-spt-intl.cnn