South Africa's Chad le Clos won the men's 100m butterfly gold at swimming's world championships on Saturday with Hungary's Laszlo Cseh second and Poland's Konrad Czerniak third.

The 21-year-old Le Clos, the Olympic and world 200m champion, clocked 51.06sec with Cseh at 0.39 back and Czerniak 0.40 adrift.

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