BOULDER, Colo. — Askia Booker scored a career-high 27 points, 11 in the last 4:40, and No. 20 Colorado rallied in the second half to hand No. 10 Oregon its first loss of the season, 100-91 on Sunday.

Spencer Dinwiddie added 23 points and Xavier Johnson and Josh Scott had 15 points apiece for Colorado (13-2, 2-0 Pac-12), which is off to its best start since the 1968-69 team began the season 13-2. Scott had 12 rebounds for the Buffaloes, who remain unbeaten in 11 home games this season.

Mike Moser had 24 points to lead Oregon (13-1, 1-1), which was denied its first 14-0 start since 1937-38. Joseph Young and Damyean Dotson both added 16 points.

Leading the nation in scoring, Oregon, one of seven unbeaten Division I teams entering the day, could not keep up with Colorado.

Down 58-48 with 14:31 remaining, Colorado worked to get back within striking distance, and surged in front when Dinwiddie and Jaron Hopkins made three-pointers around Johnson’s layup for 64-62 lead.

Elgin Cook’s layup with 6:32 left got the Ducks within 74-72 but they never regained the lead.

UCLA 107, USC 73: In Los Angeles, Kyle Anderson scored 23 points and Jordan Adams added 21 as UCLA handily beat USC in its Pac-12 Conference opener.

UCLA (12-2) scored 11 of the game’s first 13 points and never looked back.

The Bruins led by 25 points in the first half, and were able to score 56 points by intermission.

USC’s D.J. Haley cut the Bruins’ lead to three points midway through the first half but the Bruins went on a 20-6 run to build a 41-24 lead with 5:45 remaining in the half.

The Trojans (9-5) were led by Byron Wesley and J.T. Terrill, who scored 21 and 14 points, respectively.

Bryce Alford scored a career-high 20 points for the Bruins. Zach LaVine finished with 16.

“We thought they would want to run,” UCLA coach Steve Alford said of USC. “That’s the way we like to play. It was about which team was going to defend the best, which team was going to be better on transition.”

Arizona State 66, Washington State 47: In Tempe, Jermaine Marshall scored 18 of his 26 points in the second half and ASU pulled away from the Cougars for its first Pac-12 win.

Jahii Carson added 14 points and Shaquielle McKissic 12 for the Sun Devils (12-3, 1-1 Pac-12).

DaVonte Lacy, Washington State’s leading scorer for the season, was back in the lineup eight days after an emergency appendectomy but left with 6:23 to go in the first half and did not return.