ATLANTA (AP) Kyren Williams ran for two touchdowns, Ian Book passed for another and No. 4 Notre Dame moved on to its biggest game of the season with a dominant defensive performance, stifling Georgia Tech 31-13 on Saturday.

Book completed 18 of 26 passes for 199 yards in another efficient performance for the Fighting Irish (6-0, 5-0 Atlantic Coast Conference).

Williams shook off a fumble that Georgia Tech returned for a touchdown to score on runs of 2 and 4 yards. He finished with 76 yards on 15 carries.

Next up for Notre Dame: a showdown against No. 1 Clemson in South Bend. And the Irish won't have to face, Trevor Lawrence, the star quarterback who will have to sit out the game after testing positive for COVID-19.

Georgia Tech (2-5, 2-4) has lost three in a row by a combined score of 152-47.

Leading the ACC in time of possession and ranked in the top 10 nationally, Notre Dame lived up to its ball-hogging reputation on the very first possession. Book guided a 15-play, 81-yard drive that included four straight third-down conversions before an 8-yard touchdown pass to Joe Wilkins.

Georgia Tech's bright spot was provided by the defense. With Notre Dame seemingly driving for a two-touchdown lead to start the second quarter, Williams had the ball stripped away by Juanyeh Thomas just before the runner's knee hit the ground.

Zamari Walton scooped it up and scooted 93 yards down the sideline for the longest fumble return in school history.

But that was merely a brief stumble for the Fighting Irish, who responded quickly with a 75-yard drive capped by Williams' 2-yard score, led 17-7 at halftime and finished off the home team when C'Bo Flemister's scored on a 3-yard scamper early in the fourth quarter.

Notre Dame's defense had had nine tackles behind the line, five sacks and two forced fumbles.