Hau-Li Fan, of Canada, competes during the men's marathon swimming event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, in Tokyo. (AP Photo/David Goldman)

Haley Anderson, of the United States, front, swims next to Anna Olasz, of Hungary, as they near a turn during the women's marathon swimming event at the 2020 Summer Olympics, Wednesday, Aug. 4, 2021, in Tokyo. (AP Photo/David Goldman)

Ashley Twichell, of the United States, competes in the women's marathon swimming event at the 2020 Summer Olympics, Wednesday, Aug. 4, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Tiago Campos, of Portugal, competes during the men's marathon swimming event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Svetlana Kolesnichenko and Svetlana Romashina of Russian Olympic Committee compete in the duet free routine final at the the 2020 Summer Olympics, Wednesday, Aug. 4, 2021, in Tokyo, Japan. (AP Photo/Alessandra Tarantino)

Svetlana Kolesnichenko and Svetlana Romashina of Russian Olympic Committee compete in the Free Routine Final at the 2020 Summer Olympics, Wednesday, Aug. 4, 2021, in Tokyo, Japan. (AP Photo/Dmitri Lovetsky)

Svetlana Kolesnichenko and Svetlana Romashina of Russian Olympic Committee compete in the duet free routine final at the the 2020 Summer Olympics, Wednesday, Aug. 4, 2021, in Tokyo, Japan. (AP Photo/Alessandra Tarantino)

Svetlana Kolesnichenko and Svetlana Romashina of Russian Olympic Committee compete in the duet free routine final at the the 2020 Summer Olympics, Wednesday, Aug. 4, 2021, in Tokyo, Japan. (AP Photo/Alessandra Tarantino)

Kai Edwards of Australia, competes during the men's marathon swimming event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, in Tokyo. (AP Photo/David Goldman)

Florian Wellbrock, of Germany, competes in the men's marathon swimming event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)