Great start from Scottie Scheffler with a textbook drive and a stunning approach to just four feet - but the putter lets him down as he slides it by the hole and has to settle for par.

David Puig matches the four despite being 30 feet away after his second shot.

Now then. Driveable par-four.

Rory McIlroy's out with the three wood but he doesn't like it. Hooked into the bunker.

He has plenty of green to work...and that's a fine effort, landing it short and releasing it out to five feet.

And he drains the putt! The Masters champion is tied for the lead.

Considering he was outside the top 100 after 18 holes, this is a superb recovery.

Oh it's a case of close but no cigar so far for Jon Rahm, who has given himself good birdie looks on all four holes so far but has only been able to get one to drop.

It's about as close as he's come on the fourth, with a right-to-lefter from 16 feet just pulling up inches short of the hole when bang on line.

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Joaquin Niemann the latest player to go on a charge.

The Chilean eagles the 16th after backing up a monster drive with a crisp iron on to the green which lands two feet from pin. Niemann duly taps in.

Five under for the round so far.

Don't sleep on Ludvig Aberg today. The Swede shot 66 yesterday and when he gets on a roll he's not scared to go low at all.

Aberg starts his third round with a par at the first after just failing to drain a 20 footer for birdie.

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Scottie Scheffler called some of the pin placements "absurd" on Friday as he battled back from a poor start to card a 71 to stay right in the hunt.

"They are the hardest I've ever seen," said the world number one, who will like the look of today's flags a lot more.

Playing partner today, David Puig, didn't have too many problems with the pins as he shot 67 yesterday to join Scheffler on two under, with the talented young Spaniard playing superbly on these tough putting surfaces.

Puig was the best putter in the field on Friday topping the Strokes Gained rankings while Scheffler, who was sixth on Thursday, was 124th!

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Big moves all over the shop at the moment.

Sam Burns reels off four birdies in a row - the pick of them a 23-foot putt on the 15th - to move within a shot of the lead with two holes left to play.

This could be a handy round for the American.

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Remember Martin Kaymer was asked at the previous champions' dinner if he still plays golf? Well not only does he still play but he's putting together a fine round at Aronimink.

The two-time major champion just missed a great chance for birdie on 14, but even without that he's currently four under for his round and hasn't made a single bogey.

Not bad for someone who apparently had retired from golf...

The pin is cut tight to the right edge on 12 and Rory McIlroy shows some restraint, firing away from the flag.

With a driveable par-four up next and a par-five to come later, this isn't a hole to be messed with.

He comes up shy with his lengthy effort to tie the lead and accepts a par.

It's a bogey for three-time champion Brooks Koepka, however, and he's moving in the wrong direction.

Aaron Rai opened with a par but now gets in on the birdie fest currently taking place at Aronimink from just inside 20 feet.

The Englishman ended in a tie for 19th at Quail Hollow 12 months ago and is yet to finish inside the top 10 of a major.

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Brilliant round from Truist Championship winner Kristoffer Reitan, with two bogeys, three birdies and two eagles in his round of 65.

Reitan, who almost holed his tee shot on the par-four 13th, eagled that and the 16th to become just the second player in 30 years with two eagles in four holes at the US PGA Championship - Graham DeLaet did it in consecutive holes at Quail Hollow Club in 2017!

Xander Schauffele continues to move up the leaderboard as he notches his fifth birdie of the round on the 11th.

The American's irons have been top class so far today and a superb approach shot leaves him with a simple putt from two feet.

Rickie Fowler misses a birdie chance of his own after applying a fraction too much speed on his putt on the hole. He's level par.

Justin Rose's approach into the 18th stays on the right level and he has a 15-footer for a 64.

Awww, it just runs out of pace, but that's an excellent 65 for the Englishman - six birdies and one bogey - and he'll have a much later tee time on Sunday.

He's done what he needed to do today.

Rory McIlroy is absolutely smoking his driver today.

Another belter of 321 yards up the 12th fairway and he's thinking of another birdie.

From just off the front edge of the 18th green, Chris Kirk has an outside shot at birdie to become just the fifth player to shoot 62 in a major championship round.

Hmmm, it's not even close and he'll have a speedy eight-footer to save par. It slides by...and then he misses the tiny putt coming back for bogey!

Dear oh dear.

That's a sickening end to what had been a nearly faultless round.

Another glorious drive from Rory McIlroy leaves him with barely more than a flick in at the par-four 11th.

He goes slightly long, guarding against the ridge short of the pin, and drops the birdie putt in the front door!

McIlroy is one off the lead, folks. This is going to be a fun evening.

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Corey Connors started his day with a bogey and par but the Canadian has been flying since then. Four consecutive birdies have taken him to two-under for the round.

Compatriot and playing partner Nick Taylor has also made a couple of birdies to go to one under.

There's never been a winner of the PGA Championship from Canada, by the way.

Jon Rahm made the perfect start with a birdie on his opening hole and had an outside look for another on the second - but his putt just ran out of steam.

Rahm currently ranks 46th in putting for the tournament so he could do with just sharpening that aspect of his game up today.

Great try from Justin Rose from 36 feet at the par-three 17th, but it's another par.

A birdie at the last will give him a superb 64.

The dream of a second major - 13 years after his first and just a few miles down the road from Merion where he won the US Open - is still alive.

Despite missing the fairway at the par-five 16th, Justin Rose recovers to give himself a 14-footer for birdie, but it doesn't drop and that's a great chance gone for the Englishman.

With birdies flying about all over the place today, he probably needs at least one over his final two holes.