No. 5 Oregon is arguably the best offensive team in the country.

Entering the weekend, the defending Pac-12 champions led the NCAA in scoring (91.1 ppg), field-goal percentage (52.2) and assist-to-turnover ratio (1.85).

But it was a spectacular defensive play by Satou Sabally, who was 2-for-10 shooting, that helped save the Ducks during a 77-71 victory over No. 19 Arizona State on Friday night in front of a crowd of 6,769 at Matthew Knight Arena.

Taya Hanson, who had just made two clutch 3-pointers to get the visitors within a point late in the fourth quarter, had a potential game-tying shot from the corner swatted into the cheap seats by a hustling Sabally with 1:49 remaining.

“That was huge,” guard Sabrina Ionescu said after scoring 31 points on 10-for-20 shooting to lead Oregon. “A transition three like that when we’re running back on defense could have changed the outcome of the game. The girl that shot it is a great shooter, and we knew we couldn’t give her a look.

“Satou chased that ball down from half court and got a big-time block. That’s what she does for us.”

The road to repeating as conference champions seemed a little too easy in Los Angeles, where Oregon swept USC and UCLA with a combined margin of victory of 60 points.

The relentless Sun Devils (12-5, 3-3) — who have also suffered excruciating losses to No. 2 Baylor (65-59), No. 4 Louisville (58-56) and No. 6 Stanford (62-55) — pushed coach Kelly Graves’ team to the brink, as predicted during his pregame speech.

Oregon led by as many as 13 points, but after back-to-back 3-pointers by Hanson and Kianna Ibis, Arizona State trimmed the deficit to 65-63 with 4:25 remaining.

After a timeout, Ionescu hit a jumper to end Arizona State’s 8-0 run. Hanson responded with another 3-pointer to get her team within 67-66.

“That kid had made two in a row, so you figured that third one was going in, too,” Graves said of Sabally’s block on Hanson. The sophomore forward also led the team with seven rebounds. “That was a huge, huge play.”

A jumper by Maite Cazorla gave the Ducks a 71-68 lead with 1:17 remaining. Ionescu added two free throws with 26.4 second left.

Arizona State senior Courtney Ekmark hit a deep 3-pointer with 17.7 seconds remaining to make it a one possession game (73-71), but Sabally hit two free throws to ice the win.

“I loved our poise down the stretch,” Graves said. “Arizona State is never fun to play. I told the team before the game it’s like going to the dentist. We’ve got to play them, but it’s just never fun. They work their butts off, they never give up, they’re talented, the play great defense, they don’t make anything easy. And they didn’t tonight.

“That’s why it came down to the last minute. Again, proud of our team. We showed some toughness down the stretch.”

Charnea Johnson-Chapman scored three unanswered baskets to get Arizona State within 42-35 in the third quarter.

Cazorla temporarily restored order with a 3-pointer and a driving layup to make the score 51-38.

“We won. That’s what matters,” Cazorla said. “We all did what we had to do.”

Oregon led 57-47 at the end of the third quarter. The Sun Devils were second in the Pac-12 in scoring defense coming in, allowing an average of 55.7 points per game.

Ibis led Arizona State with 22 points on 10-for-14 shooting. Ruthy Hebard countered with 14 points on 7-for-11 shooting for the Ducks.

“They’re a tough team, and we knew that,” Cazorla said. “We had to play tough for 40 minutes, but I think we did a really good job.”

The Sun Devils led 16-10 after Robbi Ryan spoiled a strong defensive possession for Oregon by knocking down a deep 3-pointer as the shot clock expired.

Cazorla answered with a 3-pointer and a driving layup, and Ionescu capped a 10-0 run with a 3-pointer with 11 seconds left in the first quarter to give the Ducks a 20-16 advantage.

Back-to-back 3-pointers by Ionescu extended the lead to 31-20 midway through the second quarter, prompting Arizona State coach Charli Turner Thorne to call a timeout.

The Sun Devils responded and closed the deficit to six points before a 3-pointer by Cazorla gave Oregon a 38-29 cushion at the intermission.

The senior guard from Spain finished with 16 points in 6-for-9 shooting.

“Maite was great down the stretch,” Graves said. “When they were making that run, she gave us a solid effort and a calming influence.”