Despite something of a strange ending to regulation, the Oklahoma City Thunder toughed it out in overtime.

Russell Westbrook had 37 points and Paul George added 32 points and 14 rebounds for the Thunder in a chippy 129-121 OT win over the Portland Trail Blazers on Thursday night.

The victory gave the Thunder a four-game series sweep of the Blazers this season.

“We were resilient tonight and we did a good job of staying together,” Westbrook said. “This is a tough place to play, as we know. We had to do the right things down the stretch to win. That’s what we did tonight.”

Damian Lillard had a season-high 51 points for the Blazers, while Jusuf Nurkic added 13 points and 17 rebounds before he was sent off with his second technical with under a minute to go in regulation.

The teams had gone into the game knotted for third in the Western Conference — along with the Houston Rockets — with identical 39-25 records.

“Every time we’ve played them over the years, it’s pretty much been a war — physical, close games, chippy,” Lillard said. “This one was no different.”

Westbrook’s 3-pointer in overtime put the Thunder up 118-117 and he made a pair of free throws to extend the lead. After George made the second of a pair of free throws, Westbrook’s layup gave Oklahoma City a 123-117 lead.

The Thunder led by a slim 85-83 margin going into the fourth quarter in a game where neither side stretched the advantage to double digits.

Regulation ended with a wild final minute.

George appeared to elbow Nurkic, who was knocked to the floor as Terrance Ferguson made a layup that put the Thunder up 113-111. Portland players protested, but no call was made.

Words were then exchanged between Nurkic and George in a skirmish under Portland’s basket. After a review both received offsetting technicals, and a foul was called on the Thunder. Because Nurkic already had a technical, he was ejected and the Thunder chose Blazers reserve Skal Labissiere to make the free throws. He missed both, but a loose-ball foul was called on the Thunder and Al-Farouq Aminu made both shots to tie it at 113 with 2.9 seconds left.

After a turnover by the Thunder, the game went to overtime. But Portland was without Nurkic for the rest of the way.

“It was a hell of a game,” Portland coach Terry Stotts said. “It went back and forth, both teams were going at it, physical game. The difference was overtime. It was a hell of a game.”

Thunder coach Billy Donovan lamented the overtime, coming on the front end of a back-to-back. Oklahoma City visits the Clippers on Friday night.

“The fact that the game got prolonged was strange in itself,” he said. “But that’s the reality of it, we’ve got a quick turnaround.”

Following the game, official Ed Malloy told a pool reporter that the apparent elbow did not trigger a replay because no call was made. He also said the offsetting technicals were the result of physical contact between Nurkic and George, “which is an unsportsmanlike act.”

The Blazers were home after a largely successful seven-game, post-All-Star break road trip, during which they went 5-2. But Portland was coming off a 120-111 loss at Memphis on Tuesday night.

The Thunder had lost five of their previous six games, including a 131-120 loss at the Timberwolves on Tuesday.

In the second quarter, Westbrook shoulder checked Nurkic so hard he fell to the court. Westbrook got a flagrant, but Nurkic was given a technical for what looked like a trip a few moments earlier.

“I may have tripped him, but I didn’t do it on purpose,” Nurkic said afterward.

The Blazers led 61-58 at the break, with Lillard leading the way with 21 points.