This post was updated Dec. 16 at 9:48 p.m.

The rotation had been complete enough for the Bruins to win.

But it still had not been fully complete.

That changed Tuesday night when freshman forward Sienna Betts made her collegiate debut in No. 4 UCLA women’s basketball’s (10-1, 1-0 Big Ten) 115-28 win over Cal Poly (2-8, 0-2 Big West) at Pauley Pavilion. While the younger Betts logged just five points in her first appearance as a Bruin, her arrival coincided with another dominant showing from senior center Lauren Betts, who carried a large brunt of the offensive load with 20 points and 10 rebounds – good for her third double-double of the season.

After sitting out the season’s first 10 games with a lower leg injury, the younger Betts scored her first collegiate point at the free throw line. Her first assist had come just moments earlier, when Sienna Betts fed her sister in the paint. The sequence offered a brief glimpse into the pairing coach Cori Close has waited months to put on the floor.

“I just feel super jolly. I was just so happy to be on the court with her,” Lauren Betts said. “She’s done a lot of work, and I know that this process hasn’t been easy, but just to have that moment with her, this is something that we’ve grown up just dreaming about.”

The Bruins dominated on all fronts against the Mustangs, closing the second quarter on a 27-0 run to balloon their lead to 60-16. Cal Poly went scoreless for the final 7:30 of the half as the Bruins forced six turnovers and limited the Mustangs to just a single 3-pointer in the second quarter.

And UCLA’s control only deepened after halftime. By the end of the third quarter, the Bruins had stretched the margin to 91-21, pushing the game into historic territory before the final frame began. UCLA’s largest margin of victory remains a 97-point win over UC San Diego in 1975, but Tuesday’s gap had already surpassed most modern-era results – marking the team’s highest in the NCAA era.

“What we talk about is playing that standard throughout the entire 40 minutes of the game, not letting up based on the score, really using each opportunity to get better,” Rice said. “This is our second-to-last non-conference game, so when we come back after break, we’re going to be starting a new season, and we want to use every opportunity to prepare ourselves and get better.”

The margin allowed UCLA to use its depth extensively. Five Bruins logged double digit scoring, headlined by senior guard Kiki Rice and Lauren Betts, who posted 23 and 20 points, respectively.

And the expanded rotation – including a season-high nine minutes from freshman guard Christina Karamouzi – never affected efficiency, as the Bruins maintained a 43.3% clip from beyond the arc after outscoring the Mustangs by over 15 points each quarter.

“We just really want to win together. I think we realized throughout the season that we play at our best and at our highest level when we share the ball,” Lauren Betts said. “Everyone’s done a really good job throughout the season making sure that they’re committed to doing what they need to do for this team.”

While Lauren Betts anchored the interior, the Mustang’s attention on guarding the 6-foot-7 center opened the floor for UCLA’s guards, and graduate student guard Gianna Kneepkens finished with 19 points, five assists and six steals while graduate student guard Charlisse Leger-Walker added seven assists and four steals of her own.

And Sienna Betts wasn’t the only true freshman to etch their mark on the scoreboard Tuesday night. Karamouzi also found herself behind the free throw line to score her first point as a Bruin.

Close’s squad limited the Mustangs to single-digit scoring across the second, third and fourth quarters – a defensive effort that led to an 87-point differential, the largest since a win against Oregon State in 1976.

“Somebody asked, ‘What is the standard?’ The standards are championship standards,” Close said. “Is this what you’re going to want to be like in March, in April? March is happening now. Do not deceive yourself, you cannot miss opportunities.”

The victory marked UCLA’s first triple-digit scoring record of the season. The Bruins will face one more opponent at home in Long Beach State before tackling the remainder of conference play.