Pac-12 women’s tournament

At Mandalay Bay Events Center Saturday’s semifinals

■ Game 9: No. 1 Oregon 88, No. 4 Arizona 70

■ Game 10: No. 2 UCLA vs. No. 3 Stanford, late

Sunday’s championship

■ Game 11: No. 1 Oregon vs. Game 10 winner, 5 p.m.

Arizona coach Adia Barnes said. “There were times we played solid defense. We lost on the boards 3922, with 14 offensive. If you would have told me that, I would have said we would have lost by 40.”

The Ducks (30-2) advanced to the championship game for the third straight year. They will meet the winner of the late semifinal between No. 2 UCLA vs. No. 3 Stanford.

The teams combined for a tournament-record 25 3-pointers, with Oregon going 15 of 31 and Arizona hitting 10 of 21.

Sabrina Ionescu had 31 points, nine rebounds and seven assists and became the all-time leading scorer in Pac-12 tournament history. She has 323 points, eclipsing the total of 321 scored by Stanford’s Nnemkadi Ogumike from 2009 to 2012.

“Cutting down nets, if that was a record, that’s what I want,” Ionescu said. “Hopefully three more to go.”

Oregon never trailed, and Erin Boley’s hot shooting was a major reason. She scored 10 of her 18 points in the first quarter, and that opened everything up for Ionescu and forward Ruthy Hebard, who had 14 points and 11 rebounds.

The Ducks also took care of the ball, with 26 assists against 11 turnovers.

“Offensively we’re the most efficient team in the country by a long way,” Oregon coach Kelly Graves said. “Our true shooting percentage is best in the nation. Our turnover ratio is the best.

This is a good basketball team offensively, we’re an elite team, one of the best of all time, quite frankly.”

Aari McDonald scored 34 points to help keep Arizona (24-7) in the game, then became engaged when former Arizona football player Devon Brewer proposed to her.

“We were walking off the court, and I see my brother gesturing, like, ‘Hey, come here,’” McDonald said. “He had his phone on. I’m like, ‘What is he doing?’ And then I see my boyfriend, Devon. I’m like, ‘Wait. What?’ I looked at the sign, ‘Will you marry me?’ With all my family there”.

Cate Reese added 13 points for Arizona, and former Centennial High star Sam Thomas scored all eight of her points in the third quarter.