Hosts United States celebrated double gold at the International Cycling Union (UCI) BMX World Championships in Rock Hill.
American hopes were high in the men's event with Olympic champion Connor Fields among those to advance to the final.
It would be his compatriot Corben Sharrah left celebrating at the end of the race, however, as he came through to claim the elite world title.
Sharrah led from the start of the final and impressively held off the challenge of France’s Andre Sylvain, who ended as the silver medallist.
Bronze was earned by Sylvain’s team-mate Joris Daudet, with the defending champion forced to settle for a podium spot.
Alise Post had earlier triumphed for the US in the women’s elite event, as she held off the challenge of Australia’s Caroline Buchanan.
The podium was again completed by the defending world champion, with Mariana Pajon of Colombia rounding off the top three.
"It was close," said Post.
"Caroline came up at the end and I wasn't sure but I kept pedalling.
"There have been a lot of times I've been the bridesmaid and not the bride.
"I'm so glad to have finally gotten it."
The women's junior title was claimed by Britain's Bethany Shriever, who came through in the closing stages to pip Australia's Saya Sakakibara on the line.
Latvia's Vineta Petersone claimed bronze.
Cédric Butti of Switzerland won the men's junior race, with Kevin van de Groenendaal of The Netherlands and Latvia's Mikus Strazdins rounding off the top three.