The Boston Celtics entered the NBA In-Season Tournament Quarterfinals as slight favorites over the Indiana Pacers. And so when Tyrese Haliburton and Co. pulled off the insane upset on Monday evening, it sent the whole fanbase into jubilation.

It was a tight contest between the two teams as the game saw 15 lead changes before the Pacers pulled away in the last two minutes for the 122-112 win. Haliburton was sensational in the game, recording his first career triple-double with 26 points, 10 rebounds and 13 assists.

Aside from Haliburton, six other Pacers scored in double-digits, with Buddy Hield recording the second-most points on the team with 21. Myles Turner had a double-double of 17 points and 10 rebounds, while Bennedict Mathurin and Aaron Nesmith combined for 30 points off the bench.

Jayson Tatum and Jaylen Brown both had 30-point games–scoring 32 and 30, respectively–but only Derrick White and Sam Hauser reached the double-digit mark aside from them. Perhaps the Celtics severely missed the presence of Kristaps Porzingis down low, but regardless, they simply didn't have enough down the stretch to counter the Pacers' top-ranked offense.

Here are some of the reactions to the Pacers' epic win:

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Nathanial Duffett ·

Bucks' Giannis Antetokounmpo saying "Why so early?" and Tyrese Haliburton saying "5:30???"

Brett Siegel ·

Heat fans accuse Celtics coach Joe Mazzulla of calling a Code Red against heat

Steve Silverman ·

It's definitely a great day to be a Pacers fan. While the team still has a lot to do before they can win the NBA In-Season Tournament Trophy and the $500,000 per player cash prize that comes with it, beating the Celtics is certainly a big step in the right direction.

Not to mention that the Pacers are still undefeated in the competition after going 4-0 in the Group Stage.

For now, the Pacers and the rest of the fans can celebrate the huge victory as they await their opponents for the semifinals.