The Boston Celtics dropped their season opener after a tightly contested 138-134 double-overtime loss to the New York Knicks on Wednesday night.

Jaylen Brown salvaged 46 points on 16-for-30 shooting while going 5-for-11 from beyond the arch. Jayson Tatum finished with 20 points but went 7-for-30 from the field and 2-for-15 from behind the arch.

Boston played with great effort and energy on the floor, displaying great ball movement — they notched 34 assists as a team. They were down as many as eight points in the fourth quarter, with four minutes to play in the fourth quarter.

Grant Williams would drill two straight threes to cut the Knicks’ lead to three. Ex-Celtic Evan Fournier grabbed a three of his own to extend the Knicks lead to 112-106 with 57 seconds left but Williams cut the lead back to three with a layup. Two costly turnovers by the Knicks would allow Marcus Smart to drill a wide open three to force overtime.

Both teams were trading threes in the first overtime, and the Celtics were able to get the final shot but Tatum could not convert.

Both teams were once again trading baskets in the second overtime, with 56 seconds left Fournier hit a big three to put the Knicks up 136-134, and Tatum wasn’t able to convert on a layup, which led to a Derrick Rose transition basket to put New York up 138-134 — the clock ran out, and the Knicks would capture the win.

The Celtics look to improve to 1-1 on the season on Friday night against the Toronto Raptors at 7:30 p.m. EST.