TUCSON, Ariz. — Thomas Welsh scored 12 of his 14 points in the second half and No. 5 UCLA dominated the offensive boards to beat No. 4 Arizona 77-72 in a Pac-12 showdown Saturday night.

The Bruins (26-3, 13-3) snapped Arizona’s 21-game home court winning streak and dropped the Wildcats (26-4, 15-2) into a tie with Oregon for first place in the Pac-12 heading into the final week of the regular season. The Ducks hold the tiebreaker by beating Arizona in the teams’ only meeting.

UCLA, avenging a 96-85 home loss to Arizona on Jan. 21, trailed 53-49 at the half but took control with a 19-4 second-half run.

Allonzo Trier scored a career-high 28 for the Wildcats.

UCLA had 19 second-chance points to Arizona’s four.

No. 2 Villanova 79, No. 23 Creighton 63: Eric Paschall scored a season-high 19 points and Josh Hart added 16 to help host Villanova wrap up its fourth straight Big East regular-season title.

No. 3 Kansas 77, Texas 67: In Austin, Texas, Josh Jackson scored 18 points and Frank Mason III added 16 to help Kansas beat Texas and win its 13th consecutive Big 12 regular-season championship outright.

No. 5 Oregon 75, Stanford 73: Jordan Bell scored on a putback with 14 seconds left to give Oregon a rare Bay Area sweep.

Bell’s game-winner followed Dillon Brooks’ last-second, tiebreaking 3-pointer three nights earlier at California to give Oregon its second sweep of its conference Bay Area rivals since 1976.

No. 8 North Carolina 85, Pittsburgh 67: Justin Jackson scored 23 points, Joel Berry added 19 and North Carolina continued its march to the Atlantic Coast Conference regular-season title with an easy win at Pittsburgh.

Iowa State 72, No. 9 Baylor 69: In Ames, Iowa, Deonte Burton scored 22 points, including a crucial 3 with 1:17 left, and Iowa State won its fifth straight.

Monte Morris had 17 points with seven assists for the Cyclones, who have their longest winning streak in league play since a seven-game stretch in 2005.

Miami 55, No. 10 Duke 50: In Coral Gables, Fla., Bruce Brown scored 25 points, and Miami held Duke a staggering 32 points below its season average.

Brown shot 11 for 18 and had four assists, while his teammates shot just 11 for 40 with four assists combined. Yet it was enough for the Hurricanes, who dominated inside and outscored Duke 40-20 in the paint.

No. 11 Kentucky 76, No. 13 Florida 66: In Lexington, Ky., Malik Monk scored 30 of his 33 points in the second half and Bam Adebayo added 18 points with 15 rebounds as Kentucky took over the Southeastern Conference lead.

No. 12 West Virginia 61, TCU 60: Daxter Miles Jr. made a free throw with 4.8 seconds left for West Virginia at Fort Worth, Texas.

Miles went to the free throw line after a questionable foul against Jaylen Fisher, who never left the ground and appeared to make only slight incidental contact with Miles.

Michigan 82, No. 14 Purdue 70: In Ann Arbor, Mich., Moe Wagner scored 22 of his 24 points in the first half for Michigan.

Derrick Walton added 17 points and 11 rebounds and the Wolverines, who have won five of six.

No. 17 SMU 69, Connecticut 61: Shake Milton had 20 points and seven rebounds to lead SMU at Hartford, Conn.

No. 18 Virginia 70, N.C. State 55: In Raleigh, N.C., Freshman Kyle Guy scored 19 points to help Virginia end a four-game losing streak.

No. 19 Florida State 76, Clemson 74: Xavier Rathan-Mayes scored 13 of his 15 points in the second half, including the go-ahead basket with 1:22 left, to lift Florida State at Clemson.

Jonathan Isaac of Florida State blocked Shelton Mitchell’s drive with 11 seconds left and, after Trent Forrest made a free throw for the Seminoles, Marcquise Reed came up short on a mid-range jumper with 5 seconds to go.

Iowa 83, No. 24 Maryland 69: Freshman Jordan Bohannon scored a career-high 24 points, hitting 8 of 10 3-pointers, to help Iowa breeze past fading Maryland in College Park, Md.

No. 25 Wichita State 86, Missouri State 67: Landry Shamet scored a career-best 23 points as visiting Wichita State clinched at least a share of the Missouri Valley Conference title for a fourth straight season.

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