World champions United States stormed into the Olympic mixed 4×400 metres relay final in world record time on Friday. Vernon Norwood, Shamier Little, Bryce Deadmon and Kaylyn Brown clocked 3 minutes 07.41 seconds at the Stade de France, taking 1.39 seconds off the previous mark from the US quartet at the 2023 worlds. France and Britain followed into Sunday’s final with national records of 3:10.60 and 3:10.61, respectively. Tokyo 2020 gold medallists Poland are also through in the young discipline. World champion Faith Kipyegon of Kenya and Olympic champion Sifan Hassan of the Netherlands reach…