It was a familiar situation for the Celtics: trailing in the fourth quarter against a Nets team that’s been one of the NBA’s worst this season.

Boston was able to climb out of that hole Tuesday night, rallying to win by double digits in Brooklyn. Friday’s finish was far more humbling.

The Celtics lost to the undoubtedly lottery-bound Nets 113-105 at TD Garden after trailing by as many as 18 points. The loss dropped Boston to 8-8 and handed Brooklyn just its third win in 15 tries.

Jaylen Brown finished with 26 points on 9-of-18 shooting, eight rebounds, four assists and two steals to lead the Celtics, but he picked up his fifth foul midway through the fourth quarter, and his team cratered in his absence.

Anfernee Simons did what he could to supplement Brown’s scoring with 23 points on 1

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