Jordan Walsh’s impressive road trip earned him a promotion.

Celtics head coach Joe Mazzulla moved Walsh from the bench to the starting lineup for Wednesday night’s matchup with the Memphis Grizzlies at TD Garden. It was Walsh’s first start of the season and just the third of his three-year NBA career.

“He’s a good job with just his individual defensive assignment and having an understanding of just executing the details defensively,” Mazzulla said in his pregame news conference. “He’s made some shots, but he’s also played well offensively from a spacing standpoint. I just think his energy and his effort has been top-notch. So he’s got to keep it up.”

Walsh failed to crack Mazzulla’s regular rotation in his first two seasons, and he entered Year 3 as one of the lowest players on an unset

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