Scottie Scheffler (left) and Rory McIlroy cruise into Match Play semifinals.

AUSTIN, Texas — The golf was as good as it gets. Rory McIlroy made 17 birdies in the 36 holes he played Saturday. Defending champion Scottie Scheffler rallied with six birdies in his last nine holes to reach the semifinals for the third consecutive year.

A little luck never hurts in the WGC-Dell Technologies Match Play. And as great as McIlroy played, he needed some of that, too.

McIlroy never led in his quarterfinals match against Xander Schauffele. They came to the 18th hole all square, and McIlroy slumped slightly when he saw his drive headed left toward the trees. Schauffele hit his shot and quickly picked up his tee.

Imagine their surprise. McIlroy came upon a golf ball behind a tree and figured it was his. Schauffele was walking behind him and was stunned when McIlroy kept going.

“He hit a worse drive than I did and he ended up fine,” Schauffele said.

He got no argument from McIlroy.

“I expected my ball to be Xander’s ball on 18 behind that tree, and I got fortunate that mine trundled down the hill and obviously made the chip shot a lot easier,” McIlroy said. “Look, you need a little bit of fortune in these things, and that was a bit of luck for me today.”

Sam Burns advanced by beating Patrick Cantlay in 17 holes and then overcoming an early deficit to beat Mackenzie Hughes of Canada, 3 and 2, to reach the semifinals.

Burns advances to meet Scheffler, his best friend on tour with whom he often shares a house when they’re on the road. Their last encounter was at Colonial last year, when Burns made a 45foot birdie putt to beat Scheffler in a playoff.

Cameron Young looked as if he had an easy time, until it wasn’t. He was 3 up at the turn, missed a chance to go 4 up on the 12th and then had to go to the 18th hole before he could dispatch of Bay Hill winner Kurt Kitayama.