Warriors routed by Celtics in Kristaps Porzingis’ debut with Golden State

SAN FRANCISCO — The Kristaps Porzingis era in Golden State is off to an inauspicious start.

In their first game since acquiring the towering stretch five, the Warriors fell behind by as many as 34 points and trailed by double-digits the entire second half of a 121-110 loss to the Boston Celtics. And, for the most part, the deficit was accrued while attempting to integrate Porzingis, who finished with 12 points in 17 minutes.

Porzingis was one of six Warriors to finish in double figures...