It's a world record that might only last a day. Still, the U.S. mixed 4x400 meter relay team owns it.Related video above: The Eiffel Tower Stadium makes for a unique Olympic venue, AP explainsThe team of Vernon Norwood, Shamier Little, Bryce Deadmon and Kaylyn Brown finished the four laps Friday 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 — in an event that is only 5 years old — will be in jeopardy once again.U.S. captures bronze in 10,000-meter finalJoshua Cheptegei of Uganda took the lead with a little more than a lap left in a masterpiece of a 10,000-meter final Friday to win in an Olympic-record 26 minutes, 43.14 seconds in front of a roaring crowd on an electric opening night for track at the Stade de France.The world record holder raced in the middle of a strung-out pack for most of the 25 laps on the calm, cool evening outside of Paris. Then he took off around the curve and held the lead over the final 500 meters against a crowd of Ethiopians who set a blistering pace all night.Ethiopian Berihu Aregawi beat American Grant Fisher in a sprint to the line for silver. Fisher's bronze medal marked the first for the U.S. in the longest race on the Olympic track since Galen Rupp took silver in 2012.This was Cheptegei's season opener on the track this season — his only race at this distance was a 26:53 run in a cross-country road race earlier this season.He looked in peak form, turning a race being controlled by Aregawi and his Ethiopian teammates, who strung out the pack early and took turns in the lead, into a celebration for Uganda, which captured its first gold in the 112-year history of this race at the Olympics.The win earned Cheptegei $50,000 — a new prize for Olympic track this year — and a chance to ring the bell at the end of the stadium that is reserved only for newly crowned Olympic champions.Cheptegei adds this to the silver medal he won in Tokyo and the world titles he took in 2019, 2022 and 2023.“Now, my collection is complete,” he said. “I was the world champion. Now, I win the Olympic title. I'm so excited.”