For the second time in 18 months, Barclays Center has seen a change at the top of its management structure. Sports Business Journal reports John Sparks, brought in to run the arena in May 2011, is out, replaced by David Anderson, one of his deputies. Sparks replaced Alex Diaz after Diaz joined MSG in March 2011. Sparks decided to "go in a different direction" and left New York a month ago, Brett Yormark told SBJ. The change is not expected to affect the arena construction timetable.