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Chalmers achieved a time of 47.08 seconds in the 100-meter freestyle final at the 2020 Tokyo Olympics. This time placed him in fourth position, just behind the medalists Caeleb Dressel (47.02), Kyle Chalmers (47.03), and Kliment Kolesnikov (47.44). Chalmers' time was a personal best and the fourth-fastest time ever recorded in the event.