Scottie Scheffler and Matt Fitzpatrick both get the reward of a birdie from wonderful iron play into the 16th.

Four-time major winner Scheffler plays a wede into four feet from 138 yards, while Fitzy's effort spins back but allows him to bury a putt for a timely four from 10 feet.

Rory McIlroy has spent playing of time on the range after a difficult end to his first round at the US PGA Championship.

The Masters champion finished with four straight bogeys and said afterwards the root of his problems was not finding the fairway.

No surprise to see him with his big clubs in hand on the practice ground.

A glorious approach from Shane Lowry sets up a birdie putt, which the Irishman drains from around 14 feet.

A great ending to his round but not Viktor Hovland's, who finds the left bunker and ends up carding his seventh bogey of the round.

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Rounding up a couple of players we've not really mentioned but have impressed today - in the glut circling beneath the leaders.

Canada's Corey Conners - a ball-striker of some renown - and 2018 Masters champ Patrick Reed are both back in the clubhouse with tidy rounds of two under par safely tucked away.

Not a shabby place to be after this tough first day.

Spoke too soon about Robert MacIntyre, it seems.

He follows up a biridie at the 16th with a bogey at the 17th all because he overcooked his tee shot on the pare three.

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Justin Thomas is deep into the bunker at the 16th.

He chips out of the sand but his ball skids beyond the hole which leaves him with a 20 footer for par but he is unable to pull it off.

Two bogeys inside three holes for JT.

Justin Rose is chuntering to himself as he leaves his first putt on the 15th miles short.

The Englishman is putting from 10 feet to save par and in it drops. It would have been so deflating had that one not found its target after his recovery over the past few holes.

Scottie Scheffler and Matt Fitzpatrick also take pars and on we go.

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Norway's Viktor Hovland throws away the shot he's just worked so hard to get back.

His tee shot comes up way short on the par-three and when he races his chip - from the thicker stuff just off the edge of the green - way past the flag, he's in trouble.

Unlike Collin Morikawa, who plays into 10 feet and rolls in for birdie.

Robert MacIntyre is poised to finish well here.

The Scot picks up a valuable birdie with a putt from 12 feet on the par-five 15th.

Tommy Fleetwood comes up a few inches short with a birdie of his own.

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The 2010 champion Martin Kaymer has been speaking to Sky Sports after his excellent round of 67: "The last few years, I haven't played well. I have had a lot of injuries but when I've been able to practise, I have felt I was trending in the right direction.

"I've enjoyed the test here- it's a really fair test. I stayed in it and it was a stress-free round. It was very enjoyable.

On his biggest motivations: "On Tuesday night, at the Champions Dinner, I got asked by one of the guys from the PGA of America if I still played. I'm playing this week! That really motivated me.

"I want to compete in all the tournaments I play in. I have put myself in a good position - there are three very difficult days ahead so I'll see where it goes.

Norway's Viktor Hovland picks up a stroke on the par-five 16th after clipping into two feet with his third.

It's only his third birdie of the day and adds a slightly nicer slant to a scorecard littered with bogeys.

Justin Thomas and Cameron Young both go agonisingly close to birdies.

Thomas rolls his putt just past the lip of the hole while Young skims one just past.

Both men have to settle for birdies.

Oh hello. There have only been a handful of birdies on the par-three 14th today, which is currently playing at 3.385.

The pin is in a horrible location but listen to the roar that greets one from Justin Rose.

The Englishman looked to be scrmabling for his par there after finding the left bunker but he chips out beautifully and points to the sky as he gets back to level par.

Meanwhile, Scottie Scheffler's momentum is checked as he wafts at a par putt from five feet and misses it high, while Matt Fitzpatrick's run of pars ends with a bogey four.

As Martin Kaymer joins the leaders, another interested party also moves to three under.

American Alex Smalley had a hot start of three birdies in his opening five holes before two bogeys around the turn knocked him back.

However, back-to-back birdies has reignited his challenge - and he's back with the leaders.

Martin Kaymer just comes up short for a dream finish but he'll absolutely pocket that tap-in birdie on his final hole.

He signs for a three-under 67 and that's a share of the lead.

Rolling back the years.

Tommy Fleetwood grimaces after a 20-foot putt on the 15th comes up short.

A poor tee shot means he is unable to get on the green in two and it leaves him too much to do with the putter.

Robert MacIntyre snaffles par.

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Love that from Martin Kaymer.

The ninth hole at Aronimik is a beast of a par five at 690 yards and it's his final hole of an excellent round.

After a decent drive down the middle, the German whips out his driver again for his second shot and hits it clean off the deck. A smile lights up his face as he biffs it all the way to the green and it comes up within 15 feet.

He'll have an eagle putt to seize the outright lead.

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Finally a birdie for Justin Rose, who plays the 13th like the Justin Rose that featured at the Masters last month.

The Englishman finds the fairway off the tee and makes things look very simple as he stiffs an iron to seven feet before rolling in for a three.

There's no birdie for Scottie Scheffler, who not for the first time today is putting from over 35 feet, while Matt Fitzpatrick makes his 13th consecutive par.

A wayward tee shot from Justin Thomas at the 14th ends up striking the grandstands running alongside the course and he nearly pays the price.

Thomas drops his club on the ground in disgust with himself.

But with a double bogey looming on the green he drains a monster 38 footer to ensure he escapes with just one dropped shot.

Collin Morikawa looks disgusted with himself as he coughs up a shot on the 15th.

The American is on the dance floor in two but comes up well short from nearly 80 feet and then prods his par-saving attempt past the cup.

Routine stuff for Shane Lowry, whose second doesn't quite carry on to the front edge but it allows him to play a little bump and run to gimme range.