Kelly Clark and Zhang Yiwei won the halfpipe event of the FIS Freestyle Snowboard World Cup in Park City on Sunday, while two siblings settled for silver.
Arielle and Taylor Gold finished second in the women's and men's events, respectively, as the Americans dominated on home soil in Utah.
Clark (94.50) and Arielle Gold (88.75) produced a quinella for the host nation in the women's competition, with China's Cai Xuetong (80.75) wrapping up the podium places.
In the men's contest, Cai's compatriot Zhang won with a score of 98.00, while Taylor Gold (94.75) earned silver.
Australia's Kent Callister (88.50) claimed bronze.