The Americans had embarrassed themselves at home in the 2002 world championship, and when they haphazardly put together their team for the 2004 Olympics, nobody should have been surprised if they lost. Now the Americans run perhaps the most stable program in the world, gold medalists at both the men's and women's, senior and junior levels. Yet Mike Krzyzewski will prepare as if their opener in Rio de Janeiro is as uncertain as the one in Athens. ''I think we can lose our next game,'' Krzyzewski said.