U.S. mixed 4x400m relay initially DQs in prelims
![U.S. mixed 4x400m relay initially DQs in prelims](https://ktvz.b-cdn.net/2021/07/oly20_atx4x400_2236_uswinsheatbutisdqed_hlf_210730-1440x810.jpg)
NBC Olympics
Team USA won its heat in the mixed 4x400m relay prelims but was initially disqualified for a late exchange. The DQ was reversed just a few hours later, enabling the U.S. to compete in the final.