Caeleb Dressel wins the men’s 100m freestyle on the opening night of the US National Championships, while Anna Moesch sets a new American record in the women’s 100m freestyle. Dressel, a nine-time Olympic champion and a 29-year-old from Florida, touches first in the men’s event in 47.70 seconds. He previously won the 100m freestyle at the Tokyo Olympics and is a two-time world champion in the event. In the women’s 100m freestyle, Moesch breaks her own American record, finishing in 51.88 seconds to take the title. The results come during the championships’ opening session, with both swimmers posting winning times in their respective races.