The Celtics added offensive firepower and defensive savvy to their roster this season. But so far, they have been misfiring and out of synch.

A 99-88 loss to the Milwaukee Bucks Friday night was the Celtics’ second successive double-figure defeat. And unlike in their first game, a 120-107 result at Miami on Tuesday, the Celtics failed to produce a late rally that could have kept the crowd for the home opener interested.