Great Britain’s Richard Whitehead, Belgium's Peter Genyn, Tunisia's Walid Ktila and Kuwait's Ahmad Almutairi all set global marks in the 200 metres as preparations continued for next month’s World Para Athletics Championships in London.

Whitehead, the reigning world and Paralympic champion, knocked 0.02sec off his own world record in the men’s 200m T42 as he stormed home in 23.01sec.

"Being a father and having a family back at home means you have to make sacrifices for your sport and this year I’ve definitely spent a lot of time away, so it’s important that I put down the performances," the 40-year-old said.

"It’s nice to break my world record again and obviously that 23-second barrier - I can have a go at that in London maybe in the World Championships."

Genyn, meanwhile, obliterated the world record he set at the same track a year ago, clocking 36.62 in the men’s 200m T51 to take 0.85 off his previous best.

"I didn’t expect this time - it’s given me a lot of confidence, everything just went perfectly," said the Belgian, who finished more than a second clear of his main rival Toni Piispanen of Finland.

As for Ktila, he powered clear round the bend in the men’s 200m T33/34 to win in 26.18 and knock 0.03 off his own T34 mark set in nearby Arbon just a week ago.

"I’m very happy - it is the result of lots of hard work," said the four-time world champion, who also won the 800m T34 earlier in the day in 1:38.99.

"I will continue to work hard.

"Tomorrow I race in the 100m and I hope I will get a new world record there too."

The fastest finisher in the men’s T33 class was Almutairi, who posted a time of 29.00 to take 0.35 off his best set in Dubai in March. 

Another Para-athlete continuing to show superb form after record-breaking performances in Arbon was Canadian Brent Lakatos, who raced home to win the 200m T53 in 25.32.

The Rio 2016 Paralympic gold medallist came within 0.28 off his own world record mark of 25.04.

Having turned 37 years of age yesterday, Lakatos had further reason to celebrate with a win in the 800m T53 in 1:32.75.

In other 200m races, China’s Lei Song was the fastest of the men’s T54 racers in 24.81.

There were also impressive performances from T12 sprinter Luis Goncalves of Portugal and T44 Para-athlete Ronald Hertog of The Netherlands with respective times of 22.89 and 22.86.

Former multiple Paralympic champion Terezinha Guilhermina of Brazil claimed top spot in the women’s 200m T35-47 in 25.80, just ahead of T43 world record holder Marlou van Rhijn of The Netherlands in 26.45.

Home favourite Manuela Schär added a win in the 200m T54 in 29.33 having pipped Paralympic marathon champion Lihong Zou of China to the line in the 800m T54.

Schär, who set a European record over 1,500m a week ago, clocked 1:49.10 over two laps and was just 0.01 quicker than Zou.

In the 800m T34, five-time Paralympic champion Hannah Cockroft of Britain recorded her second-fastest ever time of 1:56.71.

It comes less than a week after she broke four world records in Arbon.

Out in the field, F57 thrower Marcelin Walico of France won the discus F31-57 with a best of 30.88m.

His compatriot Tony Falelavaki, an F44 thrower, came out on top in the javelin F35-47 with 49.94m.

Competition in Nottwil is due to continue tomorrow.