RIO DE JANEIRO — Eighteen-year old Kyle Chalmers of Australia is the new king of speed at the Olympics.

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Chalmers dethroned defending champion Nathan Adrian of the United States in the final of the 100-meter freestyle Wednesday night.

In a furious down-and-back sprint, Chalmers rallied on the return lap to win with a time of 47.58 seconds. Pieter Timmers of Belgium claimed the silver in 47.80, while Adrian made it onto the medal podium — albeit with a bronze this time — in 47.85