Dustin Johnson can smash a drive further than almost anyone else in the golf but his short game is just not good enough.

He flicks a chip up on to the 10th green but he's made a complete hash of that and the ball disappears 15, 20, 25 feet from the hole.

Andrew Landry prefers the Texas wedge and he borrows a dozen feet to almost perfection. He's in for par. Dustin has more to do.

And he's left his par-putt short. Our halfway leader is two under, two off the lead but Shane Lowry has a birdie putt over on 11...

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Ten minutes short of three hours after teeing off on the first, Andrew Landry, Dustin Johnson and Scott Piercy set off down the 10th. Sunday afternoon hackers play quicker than this.

 Landry from around 180 yards trickles up to the front edge of the green,  

Johnson with a 310 yard drive, leaves himself a short wedge into the green but he doesn't get that quite right and his ball pulls up shorter than Landry's.

Up on the 12th and Lee Westwood looks to have hit a dreamboat shot right at the flag, But he's smashed it out of the rough and it's not stopping. It goes through the back of the green, through the first cut and nestles in the second.

Shane Lowry up the hill on the 10th for a birdie but he doesn't hit it. The ball pulls up two inches short. He leaves the green with a look of utter frustration on his face. He knows how good a chance that was.

The Irishman still leads by one. We have around an hour of play left today.

Dustin Johnson with an incredible putt on the ninth. He is only 20 feet from the cup but has to putt almost that far out to the right. The ball catches the slope and races past the hole. He has five feet, straight back up the hill for par. In she pops and that's a one-over-par 36 for his front nine.

The leader at the start of play is tied for second with Andrew Landry and one off the lead held by Shane Lowry. 

Just five players are now under par. Sergio Garcia and Lee Westwood being the other two.

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-4 Shane Lowry (Ire) (9) 

-3 Andrew Landry (US) (9), Dustin Johnson (US) (8) 

-2 Lee Westwood (Eng) (11), Sergio Garcia (Spa) (9)

E Branden Grace (SA) (16), Jason Day (Aus) (14*), Derek Fathauer (US) (14), Daniel Summerhays (US) (10), Gregory Bourdy (Fra) (9), Scott Piercy (8)

Andrew Landry out of the cabbage and his ball scuttles past the flag. He is yet to drop a shot in round three. That stat may be changing in the next couple of minutes.

His co-leader Shane Lowry finds the 10th green but has a long birdie putt.

Back to nine and Landry lags his putt to six inches. Great effort, but shot gone and a level-par front nine means he is back where he started the round at three under.

Lee Westwood scrambling well on the 11th. A beautiful flop out of the bunker that stops on a sixpence a foot from the hole. He's going to escape with a par.

Andrew Landry has a poor lie in the rough on nine. And this is why this round is taking sooooooooooo long...

Scott Piercy to go first with a chip up the green, changes his mind and exchanges clubs. Has another wander up the green, back to his ball. Finally he hits it and it rolls to a couple of feet. Worth the wait? Just about.

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On the ninth, Lowry nonchalantly knocks in his birdie putt to get to four under and a share of the lead with Andrew Landry.

But American Landry is in a spot of bother as he follows up the ninth, tugging his approach into a bunker.

Sergio Garcia is yelling at his ball to stop on the ninth green. It obliges but he's a good 20-feet from the hole in three. He had driven into a bunker off the tee and smashed out short.

The par putt stays right and he is dropping one.

Lee Westwood on the 11th, struggling to get a decent stance in a fairway bunker. His feet are sliding down towards the ball and he has to be careful not to move his ball. He takes a big swing, loses his balance and his ball comes to rest in a greenside bunker.

Shane Lowry goes pin-high on the ninth with his approach. The ball keeps falling right, edging ever-closer to the hole. Another big chance for the Irishman to join leader Andrew Landry on four under.

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On the 10th, Lee Westwood barely touches his 30 foot birdie putt, yet it still slides well past the hole. He was putting down and across a two-foot slope. His par putt should be much easier. But he's missed it. Horseshoes out. Bogey and back to two under.

Back on the eighth, Andrew Landry up the hill across the green, gives it a good rattle and finishes 18 inches beyond the cup.

Dustin Johnson into his putting routine. Two gentle practice swings, putter head behind the ball and swing through. Dustin's bend of the knees tells you all you need to know. Par putt to stay three under.

Over on the fourth, out of sight to a degree, world number one Jason Day holes an eagle putt to get to level par for the tournament. He's only four off the lead. He may finish his round tonight and could post a testing clubhouse score.

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Another one slides by for Sergio Garcia. His birdie putt on the eight stays up. A tap-in par and he stays at three under.

Gregory Bourdy rolls in from 10 feet for par.

Back on the tee, Dustin Johnson munches on a sandwich before hitting a towering four-iron 245 yards into the heart of the green, he'll have a 15-foot birdie putt. Andrew Landry will have a 35-footer.

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Shane Lowry out of a beach-sized bunker on the eighth and he's not happy that he's left himself with an eight-footer for par. He leaves it out wide to go back to three under

Scott Piercy on the seventh for birdie, just pulls up short. Dustin Johnson will have been watching closely because he is putting from a similar angle.

Andrew Landry, six straight pars, is in for birdie on seven and he now leads on his own at four under.

Dustin Johnson's attempt has a little more pace as it reaches the hole that Piercy's did and as a consequence, it stays right. In for par.

Doing Ireland proud Shane. Keep it up!

Image source, Reuters

Lee Westwood down the slope for birdie on the ninth. Get in Lee. And that is a two-under-par 33 strokes for the first nine holes and back to three under.

On the par-four fourth, Jordan Spieth rolls in a birdie to get back to four over.

On the long par-three eighth, Sergio Garcia mis-hits his tee shot but such is the Spaniard's luck at the moment, that his ball skips on to the front edge and he will have a birdie putt.

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-4 Shane Lowry (Ire) (7)

-3 Dustin Johnson (US) (6), Sergio Garcia (6), Andrew Landry (US) (5)

-2 Lee Westwood (Eng) (8), Andy Sullivan (Eng) (7), Gregory Bourdy (Fra) (6)

-1 Derek Fathauer (US) (11)

Selected others: +1 Adam Scott (9), +2 Jason Day (Aus) (12*),  +5 Jordan Spieth (US), Graeme McDowell (NI) (12) +7 Danny Willett (Eng) (9*) 

Now, I know this is a tough course and everything, but when Dustin Johnson missed his par putt on the sixth, two hours ticked over since he had teed off. That's two hours for six holes.

I sincerely hope they are on the clock.

That four-way tie lasts all of 30 seconds. Shane Lowry drains one on the seventh to get to four under.

Can Sergio Garcia follow him in from five feet? No. He hits it through the break.

On the ninth and Lee Westwood pings an iron to six feet. He's got a chance of getting to three under.

Image source, AP

Sergio Garcia gets the friendliest of bounces on the seventh as his ball kicks right across the green and comes to rest half a dozen feet from the cup. 

Dustin Johnson has splashed out to 10 feet on the par-three sixth. He is putting across the slope and the ball takes a good look at the hole before refusing to drop, coming to rest an inch behind the hole. 

We have a four-way tie for the lead, with Sergio Garcia, Shane Lowry and Andrew Landry all at three under.