Indiana Pacers head coach Rick Carlisle described Pascal Siakam's performance as "tremendous" after he notched his first triple-double in 15 months to help end the Philadelphia 76ers' six-game winning run.

Philadelphia arrived at Gainbridge Fieldhouse looking to close the gap on the Eastern Conference leaders, the Boston Celtics, with a seventh straight win. However, Siakam took centre-stage in a 134-122 home victory.

Siakam finished with 26 points, 13 rebounds and 10 assists for his first triple-double with Indiana, who never trailed at any point in the game.

The victory came on the same night as Tyrese Haliburton was announced as a first-time All-Star starter, and just three days after reigning MVP Joel Embiid had a 76ers-record 70 points in a win over the San Antonio Spurs.

"We made it our kind of game," Pacers coach Carlisle said after seeing his team improve to 25-20.

"Siakam was obviously tremendous, the sixth triple-double of his career, his first, obviously, with the Pacers. When you have a power forward get a triple-double, it's pretty special."

The Pacers were without Haliburton as he missed another game due to a niggling hamstring injury, but they made light of his absence by racing into a 17-point lead within the first half.

Siakam's display was central to that, and Philadelphia coach Nick Nurse also heaped praise on the two-time All-Star, saying: "He was good, he was very good

"He got going early and when he does that, you're going to see him play really, really well. 

We got to him kind of late on some double teams and there was nobody there to rotate out, which is why he had such a big assist number."

The 76ers were made to pay for their slip-up as the league-leading Celtics beat the Miami Heat 143-110, avenging their defeat to the same team in last season’s Eastern Conference finals.

Jayson Tatum led seven Celtics in double figures with 26 points as Boston improved to 35-10, but head coach Joe Mazzulla warned the victory will be proven redundant if they don't reach the same level in the postseason.

"This game was really good, but it means nothing at all in the grand scheme of things if we don't take the lessons that we need to and apply it to the next game," Mazzulla said. 

"So, we'll enjoy it until we get to the plane and then it's onto the next one."