By Tom Byer February 2, 2011 5:47 pm February 2, 2011 5:47 pm Osama Faisal/Associated Press Yuto Nagatomo after Japan defeated Australia to win the Asian Cup in Qatar last Saturday. TOKYO — Japan has just won the Asian Cup, moved into the top 20 in the FIFA rankings and is clearly the best team in Asia. And if you think it was a fluke, think again. A few months ago in China, Japan sent its young p