Athing Mu, an American and Olympic winner in the 800 meters, added the world championship to her resume on Sunday by outdueling Briton Keely Hodgkinson in a close race.
With 300 meters remaining, Mu started to run, but Hodgkinson, who finished second to her in the Tokyo Olympics, stayed with her.
When the American drifted slightly wide into the home straight, the 20-year-old Briton squeezed into the space and appeared poised to pass Mu.
Mu, on the other hand, eased back over the field gently and steadily while keeping her shoulder in front of her competitor, closing the door to win the tape in one minute, 56.30 seconds, with Hodgkinson coming in second in 1:56.38.
Mary Moraa of Kenya won the bronze medal race in 1:56.71 seconds, a personal best.