Felicia Stancil and Simon Marquart were victorious at the BMX Racing World Championships in Nantes ©Getty Images

The United States' Felicia Stancil and Simon Marquart of Switzerland have clinched gold medals at the International Cycling Union (UCI) BMX Racing World Championships in Nantes.

Stancil was neck and neck with Marquart's compatriot Zoe Claessens in the elite women's race in France for the whole final and snatched victory by a whisker as she crossed the line in 33.144 seconds, 0.010 ahead of her rival.

Merel Smulders of The Netherlands received the bronze medal as she posted a time of 33.160.

"Oh my, I am still taking it all in," said Stancil.

"Growing up at the UCI BMX Racing World Championships meant so much to me.

"I won my second World Championship when I was 10 years old in France so this place is already special to me.

"At the beginning of the year at my first race I had my worst injury and I've only been cleared for three months now.

"This is my first elite title, I'm in shock right now."

The elite men's race saw four home riders in the eight-strong line-up, but it was the Swiss who would end up triumphant.

Marquart's time of 29.525 saw him pip Britain's Kye Whyte and Frenchman Joris Daudet to gold as they were 0.132 and 0.585 off the pace, respectively.

"I knew that there was going to be carnage in the final so I was pretty happy about starting from lane six," said Marquart.

"I thought it was the perfect lane to stay out of trouble but I had to get a good gate.

"I got second or third into the first turn and I think Eddy cased the first jump and someone was on the outside of him and I thought, ‘yes, sweet, I got this’ and finished an unreal lap.

"It feels amazing, it’s a childhood dream."