Tyrese Haliburton scored 22 points with 11 assists and nine rebounds in a performance that was drastically more aggressive than three days earlier in a series-tying loss in Oklahoma City.

Yet the Pacers’ hero Wednesday was reserve Bennedict Mathurin, who failed to play even a single second during the opening quarter yet went on to score 27 points over his next 22 minutes. It was the highest-scoring performance by a reserve in the Finals since 2011, and his offensive outburst helped Indiana’s reserves outscore Oklahoma City’s 49-18.

At halftime, holding a 64-60 lead, Indiana looked like a different team from the one that returned from Oklahoma City with a 1-1 split.

It had scored more points in transition — one of the secrets of the team’s postseason success — in just two quarters than it had scored in either of the two previous games. Indiana finished with 17 fast-break points, nearly tying its total from the first two games of the series.

And the Pacers’ reserves had scored 30 points by halftime, which was not only nearly half the team’s total but also 19 more than Oklahoma City’s own bench, the same unit that had decisively swung Game 2 in the Thunder’s favor.

Indiana point guard TJ McConnell and Mathurin were primarily responsible for that turnaround by the Pacers’ bench. Shortly after they entered, the Pacers trailed by eight points, but McConnell had soon pestered the Thunder into three steals, including two in the backcourt. After turning up the pressure with each steal, McConnell gestured to his home crowd to turn up the noise.

And after having made five shots total in the first two games of the series, Mathurin made five of his six shots in the first half alone of Game 3.

“This is the kind of team that we are,” Pacers coach Rick Carlisle said. “We need everybody to be ready. It’s not always going to be exactly the same guys that are stepping up with scoring and stuff like that. But this is how we got to do it, and we got to do it as a team. And we’ve got to make it as hard as possible on them.”

Their play earned Indiana a halftime lead. Yet Indiana’s poor finish to the third quarter, scoring just five points over the final five minutes, earned it an uphill challenge, and a five-point deficit, entering the final quarter. Oklahoma City’s vulnerability — perhaps its only one — was its lack of playoff experience, and it made the series’ return to Indiana a critical opportunity for the Pacers.

Oklahoma City indeed displayed unexpected flaws. Its 19 turnovers were its most of these playoffs.

Yet despite their youth, the Thunder at times also showed steely resolve. Rather than become rattled by playing on the road, Thunder All-Star Jalen Williams, in only his third season, led Oklahoma City out of tight jams with both his scoring and his passing late in the third quarter, and his layup with seven minutes to play in the fourth quarter helped erase what had been a four-point Indiana lead.

But Indiana, so good at comebacks throughout this postseason, played superbly in the final minutes in building and protecting its lead.

“I was proud of the way we bounced back from a rough ending to the third quarter,” Carlisle said. “That was something that could have shaken us up a lot.”

First with five minutes to play, and again just 35 seconds later, the Pacers grabbed two offensive rebounds that turned into four points when the Thunder failed to box out. Breakdowns like that helped Indiana extend its lead to eight with 3:20 to play.

“They really outplayed us in the fourth,” Daigneault said.

The Thunder have already faced a similar position in these playoffs, when they lost two of the first three games against Denver in the second round and ultimately came back to win the series.