The Ducks officially finished the three-peat before tipoff.

No. 3 Oregon clinched its third consecutive Pac-12 championship when No. 4 Stanford lost in overtime at No. 13 Arizona as the capacity crowd was filing in for the penultimate regular-season game at Matthew Knight Arena.

The Ducks (27-2, 16-1) added an exclamation point to the title with an 88-57 drubbing of Washington State in front of 12,364 witnesses.

And during the postgame celebration, which included an Oregon-made video tribute detailing the impact the deaths of Kobe and Gianna Bryant had on this team, the players finally cut down the nets on their home court after clinching the two previous titles in Tucson, Ariz.

“I think what’s been really special about what’s happened here is how our team has endeared themselves to the community. Nobody left, and it was a blowout,” coach Kelly Graves said. “We’ve had several games like that. Nobody leaves. They really love watching the team, and the energy in the building is so great.

“I’m glad we got to share that moment with the fans here at home.”

Ruthy Hebard, who only took two shots and finished with four points in 30 minutes during Monday’s 74-66 win at Stanford, scored a game-high 28 points on 11-for-15 shooting and grabbed 14 rebounds.

The senior forward matched Oregon’s single-game record for made field goals with 16 against and scored a career-high 34 points last season against the Cougars (11-18, 4-13).

“At Stanford my other teammates were in a rhythm and they were killing it,” Hebard said. “I was super proud of them. Tonight it was more (open) inside, and I just did what I could.”

Sabrina Ionescu — coming off the draining doubleheader of speaking at the memorial service for Kobe and Gianna Bryant in Los Angeles and producing a historic performance in the Bay Area — had 12 points and 12 assists.

The national player of the year favorite recorded her 26th triple-double and became the first player in NCAA history to reach 2,000 points, 1,000 assists and 1,000 rebounds in a career at Stanford.

“Craziest week of my life probably. But it builds character,” Ionescu said wearing a smile on her face and the net around her neck. “I’m definitely thankful for everything I’m going through and having somebody like Ruthy by my side and my team by my side.”

Satou Sabally added 22 points and seven rebounds in 25 minutes.

The WNBA-bound junior forward made a 3-pointer to give the Ducks a 71-38 lead in the third quarter before getting tangled up with Hebard and limping off the court with a twisted ankle.

“Satou is fine,” Graves said. “She could have gone back in, but what’s the point, you know, rest her up for what I think is going to be a really good team coming in Sunday.”

The Ducks led 53-26 at the intermission after shooting 71% (22-for-31) from the field.

Hebard made all eight of her shots and had 20 points at halftime. Sabally had 12 points, and Ionescu had 10 assists.

Ionescu had five assists and a transition layup during Oregon’s 13-0 blitzkrieg to start the game.

“I think this team is on a mission,” Graves said. “We came out in the first quarter and played as well as you can play, which says to me we’re really locked in right now.”

Washington State coach Kamie Ethridge called a timeout minutes, 54 seconds into the first quarter to settle her team’s nerves.

The Cougars started to make some shots but allowed the Ducks to make 13 of their first 15 shots (86.7%) en route to a 30-9 lead, prompting Ethridge to call another timeout with 2:09 left in the opening frame.

“We’ve just got to learn to compete at a higher level,” Ethridge said. “They’re a great example of a team that knows how to compete and has competitors from start to finish and maybe one of the greatest competitors of all time in Sabrina.”

Oregon will close the regular season against Washington on Sunday.

There will be another postgame celebration with Ionescu, Hebard, Sabally and Minyon Moore to be honored during the senior day festivities.

“It’s going to be sad, but I know we have like another six weeks of basketball left,” Ionescu said. “It’s not really a goodbye. Hopefully we’ll be able to have two more games here. We all understand that.”

For the boxscore of the game, go here.

Follow Ryan Thorburn on Twitter @RGDuckFootball and email questions to rthorburn@registerguard.com. For more Oregon sports coverage, visit DuckSports.com.