"Highlights from the Westmont Pro Swim Series Finals"
The 2023 Pro Swim Series in Westmont, Illinois, concluded with several meet records and world-leading times. Regan Smith set a new U.S. Open record in the 200 backstroke, while Leon Marchand broke Michael Phelps' meet record in the 200 IM and set the world's fastest time in the 400 IM. Hunter Armstrong also set a world-leading time in the 50 backstroke, and Lydia Jacoby won the 100 breaststroke against a stacked field.