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16-year-old Argentinian Delfina Pignatiello posted the fastest time in the final heat of the 800 free, but her 8:38.49 was not quick enough to beat out the time put up by North Carolina Aquatic Club’s Ashley Twichell in the morning heats.
Twichell won the event with a 8:36.17, six seconds behind her top time this season, an 8:30.19 from the arena Pro Swim Series meet in Austin that ranks third in the world.
Pignatiello finished second, and Carmel’s Emma Nordin took third in 8:46.32, just ahead of Great Britain’s Isobell Griffiths, who ended up fourth in 8:46.47.
Mary-Sophie Harvey finished fifth in 8:47.11, while Japan’s Runa Kasahara (8:50.75), Eliot Kennedy (8:52.33) and Great Britain’s Leah Crisp (8:53.41) completed the top eight.