Silver medalist Kristof Rasovszky, left, of Hungary, bronze medalist Gregorio Paltrinieri, of Italy, walks out of the water after the men's marathon swimming event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

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

David Aubry, of France, 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, crawls out of the water after winning the men's marathon swimming event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Ferry Weertman, of the Netherlands grabs a bottle at a feeding station during the men's marathon swimming event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Silver medalist Kristof Rasovszky, from left, of Hungary, gold medalist Florian Wellbrock, of Germany, and bronze medalist Gregorio Paltrinieri, of Italy, pose for photos during a victory ceremony for the men's marathon swimming event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Florian Wellbrock, of Germany, pours water on his face after winning the men's marathon swimming event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, in Tokyo. (AP Photo/David Goldman)

Swimmers grab a bottle at a feeding station during the men's marathon swimming event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Backdropped by the Rainbow Bridge, 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)

Water comes off the stoke of Matej Kozubek, of the Czech Republic, as he competes during the men's marathon swimming event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, in Tokyo. (AP Photo/David Goldman)

Gregorio Paltrinieri, of Italy, swims through a feeding station 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)

Athanasios Kynigakis, of Greece, tosses his battle at a feeding station during the men's marathon swimming event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

The Rainbow Bridge is reflected in the water as swimmers compete during the men's marathon swimming event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Bronze medalist Gregorio Paltrinieri, of Italy, bites his medal during a victory ceremony for the men's marathon swimming event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Florian Wellbrock, of Germany, stops for a drink at a feeding station 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, celebrates after winning the bronze medal in a men's 1500-meter freestyle final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Gregory Bull)

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)

Florian Wellbrock, of Germany, celebrates his gold medal during a victory ceremony for the men's marathon swimming event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

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)