Dalilah Muhammad (USA) poses with 2019 IAAF World Athletics Championships gold medals in the women's 400m hurdles and 4 x 400m relay, Monday, Dec. 16, 2019, in Lake Balboa, Calif. Muhammad, the 2016 Rio Olympics, is the world record holder in the 400m hurdles at 52.16 seconds. Muhammad is only the second female 400 meter hurdler in history, after Sally Gunnell, to have won the Olympic and World titles and broken the world record.
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