Silvestro clocked an unrivalled time of 30min 56.65sec at the Blue Stadium with Chile's Danyela Álvarez second in 31:42.64 and Ecuador's Kristen Del Rosario third in 32:13.68.

In the men's singles event, Peru's Álvaro Torres came out on top in 29:02.19.

Venezuela's José Guipe was the runner-up in 29:10.18, while Rosario native Federico Pacheco finished third in 29:14.39.

The men's and women's doubles races took centre stage in the afternoon.

History was made in the women's competition as Rocio Valdez and Nicole Martinez secured Paraguay's first-ever gold medal at a South American Beach Games by winning in 29:58.29.

Argentina's Milagros Porta and Maria Martina Geminiani took the silver medal in 30:09.38 and Chile's Antonia Zanetta and Sophia Miranda grabbed the bronze in 31:16.05.

In the men's event, Argentina's Francisco Schoo and Franco Calvo triumphed in 26:50.00.

Paraguay's Javier Insfran and Matias Ramirez clinched the silver medal in 26:53.65, while Chile again climbed to third place on the podium thanks to a time of 27:50.06 for Pedro Canales and Marcelo Poo.

Action in Rosario is due to continue tomorrow.