The 17-year-old visually impaired sprinter set a new American record in the under-20 T11-13 men's 200 metres with a time of 22.00sec.

It is Malone's second gold medal at the Sport Arena of the Swiss Paraplegic Centre, after he won the 100m yesterday and will be looking to complete the sprint treble in the 400m tomorrow.

Pablo Furlan of Brazil won silver in 23.00 and Samuel Naranjo Rios took bronze for Colombia in 23.85.

A new world record was set in the women's under-17 F35-38 discus by South Africa's Simone Kruger as she threw a distance of 38.63 metres on her fifth attempt after faulting three of her first four attempts.

"It's really exciting; I had a bad start, a few no throws, but now that's fine," she said. 

There was a third gold medal in as many days for Hannah Dederick, the American winning the under-20 T51-54 200m to add to her 100m and 400m triumphs.

She won in 31.47, ahead of Switzerland's Licia Mussinelli in 32.68, followed by Finland's Sini Paukkeri in 34.39.

South African double above-knee amputee Ntando Mahlangu recovered from disappointment yesterday in the 100m as he took gold in the under-20 T45-64 400m.

He ran 48.98, with Thomasz Ruan de Moraes of Brazil second, while Egypt's Karim Ramadan set an African record for T44 athletes with a time of 54.62, which also won him the bronze medal.

In the under-20 men's long jump, Britain's Karim Chan claimed the Nottwil double following his win in the under-17 event two years ago.

Chan jumped 6.70m, his best performance of the year so far.

Competition is due to conclude in Nottwil tomorrow.