At the 2020 Summer Olympics in Tokyo, Japan, King swam the third fastest time overall in the prelims of the 100-meter breaststroke and advanced to the semifinals. King advanced to the final with her swim of 1:05.40 in the semifinals, ranking second overall. In the final, King won the bronze medal with a time of 1:05.54, less than a second behind the first place finisher, American Lydia Jacoby, who swam a 1:04.95. After the race, King said "We love to keep that gold in the USA family... This kid just had the swim of her life and I'm so proud to be her teammate and win bronze for my country."