Mike Krzyzewski is returning as coach of the U.S. men's basketball team.  According to SI.com, the Duke head coach will lead the American squad at the 2016 Summer Olympics in Rio de Janeiro.  An official announcement is expected by Thursday.  The 66-year-old Krzyzewski has coached the U.S. team since 2005, but had said after last year's London Olympics that he did not plan to return for the 2016 Games or the 2014 World Cup in Spain.