The United States upset three-time defending Olympic champions Canada 5-3 on Thursday, while Sweden rocked Switzerland 9-3 in the men's curling semifinals at the Pyeongchang Olympics.The Americans and Canadians played three blank ends in a long, defensive match at Gangneung Curling Centre before the United States took the lead to deny its northern neighbor the chance at another gold.After the U.S. tied the game at 2-2 in the fifth end, neither team could score in the sixth or seventh. But the eighth was when the Americans finally broke the match open on a fatal error by Canadian skip Kevin …READ FULL ARTICLE