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Chalmers won gold in the 100-meter freestyle at the 2016 Olympics. He finished the race in 47.58 seconds, just 0.06 seconds ahead of the silver medalist, Pieter Timmers of Belgium. Chalmers' victory was a major upset, as he was not considered to be one of the favorites in the event. However, he swam a brilliant race and ultimately prevailed over a field of world-class competitors.