BOSTON -- The Celtics are undefeated at home no longer.
The Philadelphia 76ers handed Boston its first home loss of the season Thursday night, defeating its Eastern Conference rival 115-109.
The Sixers now have beaten the Celtics twice this season and jumped ahead of the C's into third place in the East with the win.
Here are three instant overreactions from Boston's loss, which drops the club to 17-7:
1. The Celtics go as Jayson Tatum goes.
Verdict: Slight overreaction
Tatum hardly needs to shoulder Boston's scoring load, as Kemba Walker paced the C's with 29 points Thursday night.
Kemba steals it from Embiid and takes it to the basket 🔥 pic.twitter.com/hECXVVOGXP— Celtics on NBC Sports Boston (@NBCSCeltics) December 13, 2019
Tatum also hit a pair of big shots down the stretch to make things interesting. But the 21-year-old guard still shot just 5-for-18 one night after going 4-for-13 in Indiana, meaning Boston now is 3-4 when he scores 17 points or fewer, compared to 14-3 when he tops 18 points.
If the Celtics want to compete with the Eastern Conference elite, they'll need Tatum to bring his A game ... or at least his B game.
2. Enes Kanter just played his best game as a Celtic.
Verdict: Not an overreaction
The Celtics big man tallied a season-high 20 points on 10-of-13 shooting to go along with nine rebounds (three offensive).
Enes Kanter gets ✌️ pic.twitter.com/On1olxergb— Celtics on NBC Sports Boston (@NBCSCeltics) December 13, 2019
But where Kanter impressed the most was on the defensive end, where he held his own with Joel Embiid and kept the All-Star center (somewhat) in check during the third quarter.
3. Ben Simmons is the third-best player on the Sixers.
Embiid still managed to get his (game-high 38 points), while Tobias Harris poured in 23 points along with seven rebounds and seven assists.
Simmons? He attempted just six shots, made only two of them (seven points) and didn't really affect the game the way a former No. 1 overall pick should.
Philly's unicorn point guard is a better all-around player than Harris and should be Philly's second-best player, but he's certainly not playing like it.
Don't miss NBC Sports Boston's coverage of Celtics-Mavericks, which tips off Wednesday at 8:30 p.m. with Celtics Pregame Live, and then Mike & Scal have the call at 9:30 p.m. You can also stream the game on the MyTeams App.