Boston guard Marcus Smart shoots in front Toronto’s Norman Powell during Wednesday’s semifinal playoff game in Lake Buena Vista, Fla. Toronto won in double overtime, 125-122, to force a Game 7 on Friday. Mark J. Terrill/Associated Press

LAKE BUENA VISTA, Fla. — The Toronto Raptors faced a sizable early deficit. They trailed in the fourth quarter. And again in the first overtime. And again in the second overtime.

Exhausted and on the brink, the reigning NBA champions rose to the moment.

Next up: Game 7, for a spot in the Eastern Conference finals against Miami.

OG Anunoby – the hero of Game 3 with a buzzer-beating 3 – put the Raptors ahead to stay with a 3-pointer with just under a minute left in double overtime, Kyle Lowry got an acrobatic jumper to fall with 11.7 seconds left and the Raptors beat the Boston Celtics 125-122 in Game 6 on Wednesday night.

“Game 7 to go to the Eastern Conference finals,” VanVleet said. “All you can ask for is a chance.”

Lowry scored 33 points in 53 minutes for Toronto. Norman Powell had 23, including a three-point play with about 39 seconds left and a pair of free throws to help finish it off. Fred VanVleet scored 21 points for the Raptors, and Anunoby had 13 points and 13 rebounds.

Lowry was on his back, laying on the court, breathing fairly heavily and with his fists thrown high in the air when Powell had the three-point play.

That’s about when he realized the Raptors weren’t flying home Thursday.

“Thank you, Norm. … That was cool. We needed that,” Lowry said.

Jaylen Brown had 31 points and 16 rebounds for the Celtics, who had their starters on the floor – without a single sub – for the final 22-plus minutes.

Jayson Tatum had 29 points, 14 rebounds and nine assists. Marcus Smart had 23 points, 11 rebounds and 10 assists, and missed a 3-pointer that would have tied it with about 3 seconds left in the second extra session.

“We had a lot of opportunities down the stretch and we didn’t take care of the all as good as we needed to,” Brown said. “That’s fine. We’re heading into a Game 7. We feel good about ourselves.”

Daniel Theis had 18 points for the Celtics. Theis played 47 minutes – the other four Boston starters, Tatum, Smart, Brown and Kemba Walker (who was held to five points, in large part because of the box-and-one that Toronto used at times), all logged at least 50. And tempers flared when it was over, everyone getting a few extra words in before Game 7 on Friday.

The numbers were ridiculous: Boston shot 44 for 100, Toronto 44 for 101.

“Great basketball game,” Boston Coach Brad Stevens said.

Boston led 52-48 at the break, after both teams had no shortage of offensive struggles in the opening half. Toronto started 9 for 32 from the floor, then finished the half on a 9-for-15 spurt to build some momentum.

It carried over, with the Raptors taking their first lead of the second half on a six-point possession from VanVleet.

He was flagrantly fouled when Smart closed out too aggressively as he tried to land on a 3-point try, made all three foul shots, then connected on a 3 when the possession continued. He then got another 3 on the next Toronto trip down the floor, giving him a personal 9-0 run that took all of 38 seconds, and the Raptors were suddenly up 67-62.

With that, it became a chess match. The Raptors didn’t score a single point in the final 4:24 of regulation. Boston led by three in the first overtime, four after back-to-back baskets to open the second OT – but couldn’t finish the champs off.

“We’ll look at what we can clean up,” Stevens said. “Throw some ice on your legs and get ready for Friday.”

NOTES: Brown took 18 shots in the first half, the most by a Celtics player in the first 24 minutes of a game since Antoine Walker took 18 on Nov. 29, 2002 – also against Toronto. … Boston fell to 17-22 since 2008 when it has a chance to clinch a series. … The Celtics will be in a Game 7 for the 33rd time; they’re 23-9 all-time – but have lost four of their last seven ultimate games. The Raptors are 3-2 in Game 7s. … Technically, home and road classifications still apply for record-keeping purposes in the bubble – so now, both teams are 0-3 “at home” in the series. Game 7 will be considered a Toronto home game.

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