'Utterly ridiculous!' - Dressel smashes Phelps' 100m butterfly world record

American Caeleb Dressel smashes Michael Phelps' world record in the semi-final of the 100m butterfly at the World Swimming Championships with a time of 49.50 seconds.

WATCH MORE: 'Swimming chose me': Is Caeleb Dressel the next Michael Phelps?

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