Germany's Florian Wellbrock dominated the rest of the field to win the men's marathon swimming at Tokyo 2020.
The reigning world champion added gold in the open-water 10km to the bronze he won over 1500 metres in the pool earlier at these Olympics.
The burgeoning distance swimming superstar finished more than 20 seconds ahead of his fellow medallists.
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Behind Wellbrock, Kristof Rasovszky survived a strong finish from Italy's Gregorio Paltrinieri to cling on to silver.
The Hungarian showed sufficient endurance to out sprint the Italian having appeared in real danger about 100 metres from the finishing line.
The open-water event was again contested in searing heat at Odaiba Marine Park, with temperatures above 30 degrees celsius soon after an early start.
Wellbrock led virtually from start to finish in a performance of real endurance and strength.
Marc-Antoine Olivier had pushed into the lead briefly near the halfway mark of the seven lap race, but the Frenchman faded to sixth at the finish.
Wellbrock's winning time was 1:48:33.7, 25.3 seconds ahead of Rasovszky (1:48:59.0).
There was disappointment for Great Britain's Hector Pardoe, with the Olympic debutant failing to finish after suffering a cut above his eye.

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The Montpellier-based swimmer was in 20th when he climbed out of the water, and was seen heading for medical attention on land.
"I was coming through the field and felt ok with a lap to go, I felt like I could of secured a top 12 and then it was over," said Pardoe, who also lost his goggles.
For Wellbrock, this was confirmation of the arrival of a potential new distance-swimming great.
The German had taken his first Olympic medal behind Robert Finke of the USA and Mykhailo Romanchuk of Ukraine in the longest event in the pool, but produced an outstanding swim to secure a first Olympic title.
He had won both the 1500m and the 10km open water in Gwangju two years ago.
Paltrinieri's bronze completes his personal set - the Italian, who burst on the scene by making the Olympic 1500m final as a teenager at London 2012, had won silver in the 800m freestyle in the pool earlier at Tokyo 2020.
That followed the gold he had won in the 1500m in Rio de Janeiro five years ago.

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