SAN DIEGO — 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.

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