Switzerland's Ditaji Kambundji claimed a shock gold in the women's 100m hurdles at the world championships in Tokyo on Monday.
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Kambundji clocked a national record of 12.24sec for victory over a loaded field.
Nigeria's world record holder Tobi Amusan took silver in 12.29sec, with American Grace Stark claiming bronze in 12.34sec.
Olympic champion Masai Russell finished fourth in 12.44sec.