BBC Sport's Ask Me Anything team look at what went wrong for Great Britain's relay squads at the Tokyo World Athletics Championship.

On the final day of the World Athletics Championships, Team USA picked up two key victories. The U.S. dominated in the 4x100m relay, taking home gold on both the men's and women's side.

The USA win their third relay as they take gold in the women's 4x100m while Great Britain come in fourth at the World Championships in Tokyo.

Sha’Carri Richardson and Noah Lyles blasted through the anchor legs of back-to-back wins in the rainy 4x100s to close out world championships with a relay sweep for the U.S.

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TOKYO (Reuters) -The United States, winners of nine of the last 10 world 4x400 men's relay golds, failed to reach the final ... The U.S. had no such problems in the women’s event, emphatically winning ...