Both squads delivered the message 😤   Team USATF sends both 4x400m squads into the finals. 🇺🇲 Fastest in the world 🌎🔥 The men of #TeamUSATF clock a World U20-leading 3:04.55 to win the final section of the 4x400m prelims and lead the field into the final. On to the next one 🫡   The women of #TeamUSATF win the opening section of the 4x400m prelims to advance to the finals in 3:32.66. 🇺🇲