Nets lose OT crusher to Celtics as rookie’s mistake opens door for Jayson Tatum buzzer-beater
BOSTON — The Nets followed their worst outing of the season with their best Tuesday night. But even if the effort was better, the outcome was the same. Defeat. The Nets fell 125-124 in overtime to the Celtics before a sellout crowd of 19,156 at TD Garden, losing on a Jayson Tatum midrange winner at the OT buzzer. Losing a game they appeared to have won. The Nets had come back to force overtime. Rookie Mikel Brown Jr. had 13 points in the fourth quarter, including a game-tying 3-pointer with three-tenths of a second left in regulation to force OT. But he missed a pair of layups late in overtime, including an inadvisable attempt with the shot clock off that gave way to Tatum’s heroics. Julius Randle — who’d scored a dozen in that fourth-quarter comeback — hit the first two buckets of the extra stanza to give the Nets a 121-117 lead. But he fouled out with 24 points, while Michael Porter…