Fun times in Cleveland spelled doom for the New York Knicks.

The new-look Cleveland Cavaliers staged an emphatic jam session on Tuesday night in the Rock and Roll Capital of the World, one that saw them take down the Knicks by a 109-94 final.

Tuesday’s game marked the first time that the Knicks faced their recurring conference rivals since the trade deadline, which saw the hosts obtain James Harden’s services from Los Angeles.

Denied a three-game season sweep of the Cavs, the Knicks (37-22) were done in by a squeamish second half. The dire stretch was headlined by a 23-11 disadvantage in the third period that saw them sink only 3-of-24 from the field, including 1-of-12 from three-point range.

Jalen Brunson led the way with 20 points for the Knicks, trailed closely by Mikal Bridges and his 18. The duo, however, needed 38 shots to hit that 38, unable to do chase down a diverse Cleveland output. Donovan Mitchell led six Cavs in double-figures with 23 points while Jarrett Allen had a 19-point, 10-rebound box score. Harden had 20 points as the Cavs improved to 7-1 since Harden and several others donned wine-and-gold at the deadline.

Unlike an eventful, if not taxing, weekend that saw the Knicks put up comeback victories over Houston and Chicago, the Knicks had no such success against the Cavs. Cleveland (37-22) let the Knicks lead for but 19 seconds before taking a permanent lead on Evan Mobley’s three with just over a minute gone by in the action.

That brought about a sense of sluggishness from which the Knicks never truly recovered. They wound up hitting 10-of-37 total with an extra point on the line (most of that earned when the outcome was well-assured in the fourth) and had trouble creating adequate separation. A perfect shooting night from Karl-Anthony Towns, for example, was marred by the fact he only got five attempts off en route to 14 points.

Even when the Knicks had some semblance of momentum, mostly sustained by relief prowess from Mitchell Robinson (15 rebounds, including eight on offense, with 11 points), they never truly dug into Cleveland’s eternal advantage.

While shooting over 51 percent in the first half (Brunson was 4-of-7 before the Cleveland crackdown), the Knicks lost 12 turnovers that yielded 11 points on the other side. A three from Towns, sunk with three minutes remaining in the half, gutted a 12-point lead to one and allowed the Knicks to somewhat withstand a late Cleveland rally paced by Allen and Mitchell.

That gave the Knicks a six-point deficit to erase in the third, which began with a bizarre delay of game call against New York before a second ticked off the latter 24’s clock. It was a harbinger of things to come, as the Knicks never inched any closer and only fell behind by as much as 20 before the final buzzer sounded.

With the win, Cleveland moved into a third-place tie with the Knicks on the Eastern Conference leaderboard. New York had already secured the head-to-head tiebreakers with holiday victories over the Cavs on opening night and Christmas Day.

The Knicks will wrap up a three-game road trip on Friday night when they face the Milwaukee Bucks (8 p.m. ET, MSG).