Caster Semenya won her third world title in the 800 meters, using her finishing kick to sweep past the competition in the finishing straight and win with ease over Francine Niyonsaba of Burundi.
Ajee Wilson took bronze and gave the United States its 28th medal of the championships, matching its all-time record.
Semenya won with a season-leading 1 minute, 55.16 seconds. The South African beat Niyonsaba by .76 seconds. Wilson finished in 1:56.65.
Semenya won Olympic gold on the same track five years ago.
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