It's a world record that might only last a day. Still, the U.S. mixed 4x400 meter relay team owns it.
The team of Vernon Norwood, Shamier Little, Bryce Deadmon and Kaylyn Brown finished the four laps in an event that's only five years old in 3 minutes, 7.41 seconds to break the mark of 3:08.80 set at world championships last year.
All the record did was place the Americans in Saturday’s final, where the record will be in jeopardy again.
