Americans Katie Grimes, Ryan Murphy and Lilly King look to add to Team USA’s medal count in swimming, which on Sunday stood at seven.

Grimes, 18, kicks off a historic pool-open water double attempt with the 400m individual medley. The Tokyo Games’ youngest U.S. Olympian, Grimes finished runner-up in this event at 2023 Worlds, four seconds behind Summer McIntosh of Canada, who’s the world record-holder and heavy favorite in Paris.

No woman has ever won a medal both in the pool and in open water at the Olympics in their career. The 10km open water event takes place Aug. 8.

Unlike the women’s 400m IM, the men’s 100m backstroke is expected to be a tight race between the respective 2023 and 2022 world champions: Murphy, gold medalist from Rio, and Italy’s Thomas Ceccon, the current world record-holder. Murphy edged Ceccon at 2023 Worlds by five-hundredths of a second and is attempting to become the first to win six individual backstroke medals.

In previous rounds in Paris, Murphy placed fourth in the heats and fifth in the semis, while Ceccon finished 12th and second.

King, likely competing at her last Games, is the 100m breaststroke world record-holder and 2016 gold medalist. She finished fourth at both 2022 and 2023 Worlds. No swimmer has ever won this event twice, and the event’s 2023 world champion is currently sidelined, but China’s Tang Qianting is the favorite after knocking on the door of King’s world record this April.

In the 200m freestyles, Romaninan teenager David Popovici is the men’s favorite, while Aussies Mollie O’Callaghan and Ariarne Titmus are set to clash on the women’s side.