By Steve Keating RIO DE JANEIRO (Reuters) - The United States continued their reign over Spain with a scrappy 82-76 win on Friday to put them through to the gold medal final of the men's basketball tournament for a third straight Olympics. The Americans will ride a 24-game Olympic winning streak into Sunday's final where they will take on tiny Serbia who will play for gold for the first time as an independent nation. Serbia stormed to an early lead then held on to rout Australia 87-61 to send the Olympic debutants through to the final.
