FILE - Bobby Finke, of the United States, reacts after winning the men's 1500 freestyle during wave 2 of the U.S. Olympic Swim Trials on Sunday, June 20, 2021, in Omaha, Neb. World swimming powers Australia and the United States will contest a Duel in the Pool competition in August. It's the first time the strong American and Australian squads have competed against each other in a match-race situation since 2007. (AP Photo/Jeff Roberson, File)

FILE - Emma Mckeon, of Australia, finishes a women's 50-meter freestyle heat at the 2020 Summer Olympics, Friday, July 30, 2021, in Tokyo, Japan. World swimming powers Australia and the United States will contest a Duel in the Pool competition in August. It's the first time the strong American and Australian squads have competed against each other in a match-race situation since 2007. (AP Photo/Jae C. Hong, File)