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IAAF World Athletics Championships 2017 medal tally: Wayde van Niekerk wins 400m gold; USA on top
IAAF World Athletics Championships 2017: Wayde van Niekerk will look to defend his 400 metres title
IAAF World Athletics Championships 2017: Wayde van Niekerk, Nijel Amos, Evan Jager in action on Day 5
