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World Record in the Mixed 4x400m | World Athletics Championships 2019 | Doha Moments
Mixed 4x400m Relay Final | World Athletics Championships Doha 2019
Mixed 4x400m Final | Tokyo Replays
Men's 4x100m Relay Final | IAAF World Championships London 2017
The reality of biology
Men's and Women's 4x400m Relay Finals | World Athletics Championships Doha 2019
Kenya wins 4x4M Relay Mixed Heat 1
Usain Bolt Dominates Mixed 4x100m
Mixed 4x400m Relay Final | World Athletics Relays Yokohama 2019
USA Win Men's 4x100m Gold | World Athletics Championships 2019 | Doha Moments
USA Take 4x400m Women's Gold | World Athletics Championships 2019 | Doha Moments
USA Storm to 4x400m Gold | World Athletics Championships 2019 | Doha Moments
