Golden State Warriors head coach Steve Kerr thought they played their “best defensive game” of the season so far against the Boston Celtics last night. The three-time champion coach expressed his dismay that they didn't come out with the victory on Friday night, per Anthony Slater of The Athletic.

The Celtics escaped San Francisco with a 105-100 victory.

Golden State dropped to 2-11 on the season, while Boston notched its 10th win in a row after losing their opening night contest.

As if the their sixth straight loss wasn't enough, the Warriors saw another one of their stars go down with an injury. All-Star guard D'Angelo Russell exited the contest in the second quarter with a sprained thumb.

Golden State held a 5-point cushion with 2:37 remaining in the fourth quarter after Ky Bowman delivered a nice alley-oop to Willie Cauley-Stein for the layup. Unfortunately, the Warriors just didn't have enough fire power to close out the Celtics, which went on a 13-3 run down the stretch.

These kinds of disappointing nights are going to be abundant and plenty throughout this year for the once golden dynasty. Kerr certainly wasn't used to this over the past five seasons with such a juggernaut squad.

Now, with a team full of young and unproven players, the Warriors have to claw and scrap every night just to have a chance to win.

Nevertheless, the important thing is that the Warriors are having progress on that end. Golden State has no choice but to take advantage of this opportunity to develop and give their young guys more reps with all their stars nursing some ailments.