SAN DIEGO (AP) — Bennedict Mathurin made a 3-pointer to force overtime and scored six more points in the extra session, and top-seeded Arizona outlasted ninth-seeded TCU 85-80 on Sunday night in the second round of the NCAA Tournament.

Mathurin finished with 30 points and Christian Koloko scored 28, including a putback dunk that slammed the door on the Horned Frogs with 9 seconds left in OT after Mathurin missed a 3.

Koloko was 12 of 13 from the field, including five dunks, but the rest of the Wildcats were 19 of 55, including 5 of 27 on 3-pointers.

Still, Arizona’s two stars did enough for the Wildcats (33-3) to avoid becoming the second No. 1 seed to fall during this tournament’s opening weekend. They advanced to Thursday’s South Region semifinals in San Antonio, Texas, where they will face fifth-seeded Houston.

Chuck O’Bannon Jr. had 23 points for TCU (21-13) while Mike Miles Jr. and Eddie Lampkin Jr. had 20 apiece. The Horned Frogs were looking to get to the Sweet 16 for the first time.

TCU still had a chance to win in regulation after Mathurin’s big shot, but Miles lost the ball near midcourt. Dalen Terry tried for a game-ending dunk but he didn’t get the shot off before time expired.

Mathurin became the sixth Arizona player to score at least 30 points in an NCAA Tournament game.

TCU trailed by eight points with less than eight minutes remaining and had missed 12 straight shots before scoring 12 straight points to go up 69-67 with 3:39 remaining. O’Bannon scored the first five points and Miles had the last four.

The Horned Frogs held Arizona scoreless for 5:09 before Terry’s 3 from the right corner tied it at 70.

KRIISA RETURNS

Arizona’s Kerr Kriisa had three points in 27 minutes off the bench after missing the past three games.

The sophomore point guard’s season looked to be over after he suffered a sprained ankle when he collided with Koloko in the final minute of a Pac-12 Tournament quarterfinal matchup against Stanford on March 10.

He missed his first five shots before hitting a 3-pointer from the left corner that began a spurt of nine straight Arizona points to give it a 67-58 advantage.

BIG PICTURE

Arizona: The Wildcats are 6-1 as a top seed in the second round since 1985. The only loss was to Wisconsin in 2000.

TCU: The Horned Frogs got their first NCAA Tournament victory in 35 years Friday night, but coach Jamie Dixon’s dream of a deep tourney run for his alma mater will have to wait at least another year.

UP NEXT

Arizona will face Houston for the first time since 2009. It will be the teams’ first meeting in the NCAA Tournament.

___

More AP coverage of March Madness: https://apnews.com/hub/march-madness and https://apnews.com/hub/college-basketball and https://twitter.com/AP_Top25