SEATTLE — Freshman Kiana Williams provided the offensive fireworks, and Stanford’s defense did the rest Saturday night.

Williams hit six three-pointers in seven tries and scored 24 points to lead Stanford past Arizona State 58-46 in the semifinals of the Pac-12 Women’s Basketball Tournament. The Cardinal also slapped a tourniquet-tight defense on the Sun Devils.

Asked if the basket looked as big as a hula hoop to her, Williams said, “I would agree, but my teammates did a good job of finding me. We do a great job of moving the ball.”

The No. 16 Cardinal, the 2-seed, will pursue their 13th conference tournament title in the event’s 17-year existence with they take on top-seeded Oregon in the final Sunday at 6 p.m.

The No. 6 Ducks held No. 9 UCLA, the 4-seed, without a point in the final 5:28 and beat the Bruins 65-62 for the third time this season.

Sabrina Ionescu, the conference Player of the Year from Miramonte-Orinda, scored 17 points to lead the Ducks (29-4). Jordin Canada had 19 points and Monique Billings 18 for the Bruins (24-7).

Elaine Thompson/Associated Press

Freshman of the Year Satou Sabally of the Ducks left the game with an injury with 6:05 left and UCLA leading by six. Oregon went on a 13-4 run after that, and UCLA missed its last seven shots. Oregon committed a season-low seven fouls. Sabally’s status for the final wasn’t immediately known.

The heavily pro-Oregon crowd helped energize the Ducks down the stretch, Ionescu said.

“They stood with us throughout the whole game,” she said. “We were down 13 (in the second quarter), and they were still pumping us up and cheering us on. That’s really nice to see. So we hope they come out (Sunday night) and continue to help us get this win.”

Stanford (22-9) beat Oregon in Eugene 78-65 in their only previous meeting this season.

Cardinal head coach Tara VanDerveer said, “Oregon gives you the ultimate challenge. They have a great outside game and a great inside game. .. They’re a legitimate top-10 team, and we’ll have to play very well to beat them again.”

She pointed out that Ducks forward Ruthy Hebard made 33 straight shots earlier this season. “I don’t think I could make 33 straight shots without a defense,” she said.

Williams is shooting 58 percent (19 for 33) from deep in her last five games. She hit three baskets, two of them three-pointers, in the third quarter as Stanford built a 42-25 lead. She finally missed a three, after five straight makes, midway through the third quarter. Then she came back and hit a sixth.

Her 61 made threes are the third most for a Stanford freshman in program history behind Jamie Carey’s 81 (1999-2000) and Lindsey Yamasaki’s 65 (1998-99).

ASU head coach Charli Turner Thorne said, “We had beaten that team before, and our team felt good about the opportunity to get a rematch with them. Maybe it was fatigue or tension, or a little bit of both. We weren’t ourselves.”

The final score made the game seem deceptively close. The Sun Devils finished the game with a 16-2 run against the Stanford reserves.

Alanna Smith, who scored 13 points, hit a three at the buzzer at the end of the third quarter, giving Stanford a 52-28 lead. The reserves played most of the fourth quarter.

Kiara Russell had 12 points and Charnea Johnson-Chapman 10 for the Sun Devils (21-12). The Cardinal held Courtney Ekmark, a 10.2 scorer, without a point and Kianna Ibis, who averages 12.6, to six.

“We know Ekmark’s a fantastic shooter, so we needed to stay close to her and make sure she didn’t get any open threes,” Smith said. “Ibis is a great post player, can shoot the ball great in the paint. We knew we had to be award of her. I think we did a really good job just as a team.”

Stanford’s Brittany McPhee was held to a season-low three points a night after getting just seven against USC. VanDerveer said she was struggling with a cold.

“Just her being out there helps other people,” she said. “She runs the floor. She’s working hard defensively… We have confidence in Brit. We know she’ll step up big (Sunday night). It’s hard. She gets the other team’s best defender.”