PORTRUSH, Northern Ireland — The rain pounded Royal Portrush right when Scottie Scheffler poured in a birdie putt on his first hole Friday in the British Open. No matter. Nothing stopped the world’s No. 1 player on his way to a 7-under 64 to build a one-shot lead going into the weekend.

Scheffler made eight birdies on another wild afternoon of weather at Royal Portrush, and his 15-foot birdie attempt on the 18th stopped inches short for another.

The result was a one-shot lead over former U.S. Open champion Matt Fitzpatrick, who made four straight birdies to start the back nine until he cooled on the home stretch and had to settle for a 66.

The rain was heavy at times but never lasted long. The wind was breezy but never at strength that can cause fits. The scoring was lower, nearly two shots easier than the opening round.

Except for a few chasers, Scheffler made it look like it wasn’t enough.

He was at 10-under 132 as he chases the third leg of the career Grand Slam, having won the PGA Championship by five shots in May.

Brian Harman got the best of the weather — surprising sunshine — and took dead aim in his hunt for another claret jug. Harman played bogey-free for a 64 that left him only two shots behind, along with Li Haotong of China, who had a 67.

Everyone else was five shots behind or more.

That includes Rory McIlroy, who went around Royal Portrush in his native Northern Ireland with plenty of cheers but only a few roars. McIlroy had a 69 but lost a lot of ground because of Scheffler, Fitzpatrick and Harman.

He started the second round just three shots behind. He goes into the weekend seven shots behind the top-ranked player in the world.

Fitzpatrick was at his lowest point just four months ago when he changed his caddie and coach and began pulling himself up. And now he takes that into the weekend against Scheffler.

“He’s going to have the expectation to go out and dominate. He’s an exceptional player. He’s world No. 1, and we’re seeing Tiger-like stuff,” Fitzpatrick said. “I think the pressure is for him to win the golf tournament. For me, obviously I hope I’m going to have some more home support than him, but it’s an exciting position for me to be in given where I was earlier this year.”

Fitzpatrick was rolling along until a pair of short putts he missed, from 5 feet for par on the 14th and from 3 feet for birdie on the 17th. Even so, he holed a 25-foot par putt on the final hole and assured him being in the last group at 9-under 133.

Scheffler was sharp from the start. He hit eight of the 14 fairways — compared with three in the opening round — though his misses never left him too badly out of position. But he is seeing the breaks on smoother Portrush greens, and he looks confident as ever.

None of his eight birdies were closer than 7 feet. Five of them were in the 10-foot range and then he threw in a 35-foot birdie on the sixth.

His lone bogey came on a drive into deep grass on the 11th that kept him from reaching the green.