CHAPEL HILL, N.C. (AP) — Ian Book kept No. 2 Notre Dame’s offense moving while the defense locked down Sam Howell and No. 25 North Carolina’s potent offense for the final three quarters in a 31-17 victory on Friday.

Book threw for 279 yards and a score and ran for 48 yards for the Fighting Irish (9-0, 8-0 Atlantic Coast Conference, No. 2 CFP), using his mobility and elusiveness to keep plays alive on a night when both offenses frequently faced long fields.

Receiver Ben Skowronek got Notre Dame its first lead with his 13-yard run around the right side midway through the third quarter. Kyren Williams ran for 124 yards — including a 47-yarder with about 5 1/2 minutes left as the Irish burned clock and sealed the game

UNC (6-3, 6-3) sprinted to touchdowns on its first two drives, but Notre Dame surrendered only one field goal from there.

No. 15 Iowa State 23, No. 20 Texas 20

AUSTIN, Texas — Breece Hall scored on a 3-yard run with 1:25 remaining and Iowa State held off last-minute drive by Sam Ehlinger and Texas to remain in first place in the Big 12.

After Iowa State sacked Ehlinger on third down, Texas’ Cameron Dicker barely missed left with a 58-yard field goal attempt as time expired.