On Sunday afternoon, the Smith duo posted a pair of 20-point performances to vault the University of Colorado women’s volleyball team to a 3-1 upset of No. 21 Washington in Boulder.

The 25-12, 25-21, 21-25, 25-22 win is the second top-25 victory for the Buffs this season, who improved to 13-10 overall and 5-7 in Pac-12 play. Washington falls to 13-9 with the same conference record as Colorado.

Alexa Smith and Anyse Smith combined to thwart the Huskies with 35 combined kills, hitting better than .350 with 10 combined blocks.

Alexa Smith led the team with 19 kills, posting her second-straight 20-point performance. She hit .356 and posted a pair of blocks.

Meanwhile, Anyse Smith had the second-highest kill count in the match with 16 kills, hitting .367 and putting down a career-high eight blocks.

The Buffs’ blocking was the key to victory.

CU tied its season-high with 16 blocks, led by senior Naghede Abu who had 10 block assists. Emily DeMure added four block assists with Danielle Price posting three.

Justine Spann had a defensive day with 20 digs and a pair of solo blocks. Spann accounted for a third of the team’s digs. Libero Rachel Whipple added a dozen digs.

“It was a great win (because) first of all, Washington is a good team,” CU head coach jesse Mahoney said in a CU news release. “To be able to play at the level that we did in four sets was really good to see. We only really had one bad spell in the third set.

“Besides that, I’d say that we were really consistent offensively. Defensively, I was happy with the defense against their left side hitters. We’ve worked on that a lot since the last time we played them. I thought that was really effective.”

The Buffs’ defense was stifling all afternoon, holding Washington to a negative hitting percentage in the first set — only the second time this season CU has held an opponent negative.

The 25 percent sideout that the Huskies posted in the first is the worst a CU opponent has recorded all season . Colorado also held Washington to a .150 or worse hitting percentage in all the sets except the third.

CU now hits the road for a Wednesday matchup at California, then closes out the week Friday at No. 2 Stanford. Friday’s match will be the 1,000th match in CU history.