Kyrie key component in Boston's offseason overhaul

BOSTON - Kyrie Irving turned the NBA world upside down multiple times over the summer.

It happened the first time after news leaked out that he had asked the Cleveland Cavaliers to trade him from the team he helped lead to a championship in 2016.

Then Irving was in the spotlight again as the centerpiece of a blockbuster trade that sent him to the rival Boston Celtics in exchange for a package that included Isaiah Thomas and Jae Crowder.