TOKYO (AP) — A faulty exchange in the Olympic debut of mixed 4x400-meter relay cost the U.S. a spot in the final and might have cost Allyson Felix a chance at her record-setting 10th Olympic medal. The U.S. breezed to a victory in the first qualifying heat of the relay but was disqualified because of a bad pass between Lynna Irby and Elija Godwin. It's the latest in a decades-long series of mishaps for the U.S. in relays. Most have come in the shorter 4x100 relay where the pass is a more technical and time-sensitive move.

https://www.wave3.com/2021/07/30/again-faulty-exchange-olympic-mixed-relay-proves-costly-us/

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