ARLINGTON, Texas (AP) - Trevor Lawrence threw for 327 yards and three touchdowns and No. 2 Clemson beat No. 3 Notre Dame 30-3 on Saturday in the Cotton Bowl to reach the College Football Playoff championship game for the third time in four seasons.

The Tigers (14-0) will play either No. 1 Alabama - for a fourth straight season in the playoff - or No. 4 Oklahoma on Jan. 7 in Santa Clara, California.

Clemson's overpowering and experienced defensive line, led by ends Clelin Ferrell and Austin Bryant, smothered Ian Book and the Fighting Irish (12-1), holding them to 248 yards. ''Our guys, they got it done in the trenches,'' Swinney said.

On offense, freshmen led the way. Lawrence, making his 10th career start, was 27 for 39 and did not throw an interception against a Notre Dame defense that had been one of the best on the country. Freshman receiver Justyn Ross had six catches for 148 yards and two long touchdowns.

The Irish hung around for a quarter, with the team's exchanging field goals. But early in the second quarter, Notre Dame All-America cornerback Julian Love went out with what coach Brian Kelly said after the game was a head injury and Lawrence started taking apart the Irish secondary.

Lawrence hooked up with Ross on a deep throw down the sideline and the big receiver beat Love's backup, Donte Vaughn, for a tackle-breaking, 52-yard score early in the second quarter. The Irish looked as if they might be able to keep it close to halftime, but the offense couldn't keep that ferocious Clemson front, even without suspended star tackle Dexter Lawrence, out of the backfield.

In the final 2 minutes, Trevor Lawrence connected with Ross on a 42-yard score and with Tee Higgins for a one-handed, 19-yard touchdown reception - again over Vaughn - with 2 seconds left in the second quarter. Lawrence was 13 for 15 for 229 yards in the quarter.

That made it 23-3 at half and once again the Fighting Irish looked outclassed against the best of the best.