World champion Kristof Rasovszky of Hungary has taken gold in the men's 10km marathon swim in the Seine, with Ireland's Daniel Wiffen finishing 18th.
Rasovszky, known as the 'The Balaton Shark', was joined by 28 rivals who set out from the Pont-Alexandre III bridge in central Paris for this open-water event.
A silver medallist at Tokyo 2020, Rasovszky, along with Germany's defending champion Florian Wellbrock and Italian Gregorio Paltrinieri dictated affairs at the front for most of the race.
Rasovszky was never worse than third at any point in the race and assumed a lead he would never relinquish during the fourth of the six laps in the event.
Wiffen, taking part in the event for the first time, was soon detached from from the leading group. He was 14th at the halfway point and eventually came home in a time of 1:57:20.1.
While Rasovsky maintained his lead, Oliver Klemet came with a late surge but could not catch the Hungarian, who won in 1:50:52.7. Kelmet's clocked 1:50:54.8, with Rasovsky's compatriot David Betlehem third in 1:51:09.0.
Wellbrock faded in the latter stages of the race, eventually finishing in eighth.
Four swimmers failed to finish the punishing race, while Tunisia's Ahmed Jaouadi and Sweden's Victor Johansson did not, with the latter citing concerns about the water quality.
"It's probably one of the worst things I've ever done but happy I did it... I'm retiring from open water!" - Daniel Wiffen is planning "to party" after completing his superb Olympics with the 10km marathon swim
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Speaking after the race, Wiffen said it was "probably one of the worst things" he has ever done.
He told RTÉ Sport: "When I got to halfway, all I was thinking was 'I'm already Olympic champion and I’m swimming this and I’m coming 18th, we’ll just finish it now and then I’m never doing it again.’
"My goal coming into this was to finish, I’m very pleased with myself and happy I didn’t come last so that’s the main thing.
"All the coaches were laughing because I was swimming out by myself because I wasn’t arsed going behind somebody, I can’t be arsed getting kicked in the face.
"I got a couple of elbows in the eye and punched in the face at one point, this sport isn’t for me. I definitely want my own lane next time."
"I’m so happy I’ve completed it and I’m retiring from open water," he added.
