Celtics three-point shooting:
last year/this year/since Dec 1st
Tatum: 37.6%/36.4%/34.6%
Brown: 35.4%/32.2%/30.1%
White: 39.6%/38.5%/34.6%
Holiday: 42.9%/34.5%/34.6%
Horford: 41.9%/36.0%/29.8%
Hauser: 42.2%/37.4%/41.3%
Porzingis: 37.5%/34.9%/36.0%
Pritchard: 38.5%/41.4%/38.7%
7 of their top 8 rotation players are shooting worse from three this year than last, and its been especially bad in the stretch since December 1st. Alot of the issue they are having is they just can't seem to make shots. Got to think water will eventually find its level with the shooting.
It's likely a volume and shot quality issue. The Celtics have been jacking up a ton of bad shots this season, all for the sake of taking more 3's per game. We're talking off the dribble, contested 3's early in the shot clock without passing the ball. I can understand emphasizing 3's, but they should come within the flow of a good offense. These shots are not that. They're bad shots. Low percentage shots.
More driving, inside out basketball that leads to open 3's will result in better percentages.
The data doesn't really back this up either.
Looking at NBA.com/s tracking data, last year the C's took 36.8 of their 42.5 threes per game with 4+ or 6+ feet of separation from the nearest defender. Thats 86.6% of their threes were open or wide open. This year its 41.6 of 48.6 threes a game, or 85.6%. So although they are taking more threes, they've generally been the same amount of open.
What HAS changed is the make rate. Last year they were 38.8% on open threes and 41.6% on wide open threes. This year its 36.3% on open threes and 38.5% on wide open threes.
Once again the issue isn't type of shot. It isn't chucking. Its not poor decision making. It's just that they are missing shots they made last year. It's really that simple.
The team has two issues right now:
1) Shooting slump
2) Crunch time defense has been bad.