Four of the Americans’ six titles came in under-18 competition with Miguel Jimenez-Vergara among the winners at the Swiss Paraplegic Centre.

The Raza Point System is being used to decide the winners at the event, meaning points are awarded to each athlete according to their specific class and their final performance.

Jimenez-Vergara triumphed in the men’s 400 metres T51-54 with 651.568 points, followed by Australia’s Samuel Rizzo with 631.349 and fellow American Spencer Kimbro with 600.562.

Other victors from the US included Beatriz Hatz in the women’s 200m T42-47 and Hannah Dederick in the women’s 400m T51-54.

Hatz came out on top with 879.181 points, beating nearest challenger Alissa Jordaan of Australia by a margin of 225.434 and third-placed Simran Kaur of Great Britain by a further 35.198.

Dederick, meanwhile, prevailed on 697.175 points with two-time Youth Parapan American champion Lucia Montenegro of Argentina second on 612.324 and fellow American Elizabeth Floch third on 498.190.

The US’s Sophie Munter was the only competitor in the women’s 400m T33-34.

In under-20 competition, America’s titles came courtesy of Abby Farrell, the only competitor in the women’s 400m T51-54, and Isaiah Rigo in the men’s 400m T51-54.

Rigo posted a total of 819.162 points and was followed in the standings by Britain’s Jack Agnew, the runner-up with 587.000, and fellow American Phillip Croft, who rounded out the podium with 557.994.

Britain achieved an under-18 long jump F20 double with Karim Chan and Esme O'Connell winning the respective men’s and women’s events.

Chan registered 696.00 points with Brazil’s Gustavo Henrique de Oliveira Dias second on 672.00 and Iceland’s Fannar Logi Johannesson third on 154.00.

As for O'Connell, she put 392.00 points on the board with Turkey’s Muhsine Gezer second on 308.00 and Belgium’s Anke Sneyers third on 71.00.

Colombia were the dominant force in the under-20 field events as Luis Lucumi lived up to his billing as favourite for the gold medal in the men’s shot put F35-38 and Diego Fernando Meneses Medina won the two-competitor men’s discus throw F32-34 event. 

Lucumi, the Rio 2016 silver medallist in the men's javelin throw F38, scored 586.00 points.

Mexico’s Rodrigo Jacob de la Torre Huerta finished second on 306.00 points and Iran’s Ashkan Cheraghi came third with 167.00.

Meneses Medina beat Iran’s Mohammadtaha Beygrezaei to success, scoring 653.00 points to his opponent’s 647.00.

Action in Nottwil is due to continue tomorrow.