Olympics: USA set new world record in mixed 4x400m relay

The United States set a new world record in the heats of the mixed 4x400m relay at the Paris Olympics on Friday. The quartet of Vernon Norwood, Shamier Little, Bryce Deadmon and Kaylyn Brown timed 3 minutes, 07.41 seconds, smashing the previous best of 3:08.80 set when the US won world gold in Budapest last

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