BOSTON — Payton Pritchard admitted he was “disappointed” in his past two games. Even those close to him wondered what was up as he put together uncharacteristic performances. There was too much second-guessing and deliberation for a guy who often talks about his endless confidence.

So, after Pritchard woke up Wednesday, he got back to the basics: He went to get a haircut. He got back to his routine. And it all worked. Pritchard was everywhere as the Celtics blew out the Grizzlies . It’s not the first time — nor will it be the last — that he feels mentally like he’s in a funk. But he explained how on the other side of those struggles is an opportunity for growth.

“I actually have gone through it a lot,” Pritchard said. “And to be honest, when I go through them is usually when I kind o

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