GWANGJU, South Korea -- Ana Marcela Cunha keeps setting the bar higher in open-water swimming at the world championships.
The 27-year-old Brazilian won an unprecedented third consecutive 25-kilometer race on Friday and her second gold medal of the Gwangju titles after winning the 5-kilometer race on Wednesday.
It was also her fifth gold medal and 11th overall at the world championships since 2011.
Cunha finished in 5 hours, 8 minutes, 03.00 seconds -- 8.60 seconds ahead of second-place finisher Finnia Wunram of Germany. Lara Grangeon of France claimed the bronze, 18.20 seconds behind Cunha.
In the men's race, Axel Reymond dueled with Russian Kirill Belyaev over the final meters before the Frenchman lunged ahead for a three-tenths of a second victory.
Reymond finished the men's race in a time of 4:51.6.20, while Belyaev clocked 4:51.06.50. Alessio Occhipinti of Italy earned the bronze medal, 3.30 seconds behind Reymond.
Another Italian, Simon Ruffini, was fourth, 8.70 seconds behind. Australian Kai Edwards took fifth, 11 seconds behind Reymond.
The top Americans in the men's race were David Heron in 14th place, 4 minutes, 05.60 seconds behind the winner, and Brennan Gravley, who finished right behind Heron in 15th, 6:11.30 behind.
American Erica Sullivan was fifth in the women's race, 3 minutes, 20.20 seconds behind Cunha, while teammate Katy Campbell finished in ninth place, 3:56.60 behind the winner.
Only two of the 24 starters failed to complete the men's race, while five of 21 women did not finish their race.
The 25-km races ended the seven-event open water program at the worlds. Only two open-water events will be held at the Tokyo Olympics next year -- the men's and women's 10-km races -- and the top 10 finishers here qualified for those events.