KRASNAYA POLYANA, Russia (AP) - The U.S. has swept the podium in men's slopestyle skiing.Joss Christensen soared to gold in the sport's Olympic debut, posting a score of 95.80 on Thursday to beat teammates Gus Kenworthy and Nick Goepper.The gold was the fourth for the U.S. in Sochi, all won on the slopes of the Rosa Khutor Extreme Park.