The 2019 IAAF World Relays was held in Yokohama, Japan from May 11 to May 12, 2019.[1] Two new events were established for 2019, both mixed events: the 2 × 2 × 400 m relay and the shuttle hurdles relay.[2] The first event replaced the 4 × 800 m relay that featured at previous events.[3]
Teams scored for every place in the top 8 with 8 points awarded for first place, 7 for second, etc. The overall points winner was given the Golden Baton.[4]
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