Fowler on the march, Koepka on the slide
He joins Westwood on -9 with a 20ft birdie putt on the fourth that turned in from the right in the last couple of inches. Brooks Koepka has racked up his third successive bogey and slips back to -6 after three holes.
As you were
JB Holmes makes par at the second. Behind him, off the tee, Fleetwood finds the thick dandelions down the left and needs an excellent recovery shot to find the fairway. Lowry is in the first cut in front of the fairway bunker, 170 yards from the pin.
Rose misses a 9ft par putt at the 8th to drop a stroke to eight-under and Westwood secures par at the 4th to take sole hold of 3rd place.
Rickie Fowler has undone the damage of the first-hole double bogey with birdies at the second and third, by virtue of wonderful drives.
Fleetwood's third to the second green, having had to lay up, is superb, using the wind to give him maybe 10ft for birdie. Lowry, from 70 yards, doesn't hit his pitch as sweetly and his ball plugs about 16ft from the hole for his birdie chance.
Lowry gives his birdie effort every chance, judging the weight right but it stays up on the left and dribbling a couple of inches past. He stays on 15-under. Fleetwood can use Lowry's example to read it but his putt also stays up.
-15 Lowry (2)
-12 Fleetwood (2)
-9 Westwood (4)
-8 Willett (4) Fowler (3), Rose (3), Holmes (3)
Lowry in trouble
His second shot to the first green is a mirror of Spieth's, losing control out of the rough and arrowing it into the deepest greenside bunker, front left of the pin, 50+ yards from the hole. Fleetwood, from much safer territory, pitches perfectly to within 8ft to give himself a fine birdie chance. Potentially a significant swing here.
Westwood, meanwhile, birdies the second and third, chipping in from the swale-like ridge to the front of the green. He's up to nine-under now.
Lowry splashes out about 45ft from the pin, leaving him a monster for par that he leaves about 8ft short.
Fleetwood's birdie chance will break late from the right but he doesn't catch it right and has to settle for par. Lowry lines up his bogey putt and drains it.
-15 Lowry (1)
-12 Fleetwood (1)
-9 Westwood (3), Rose (2)
-8 Thomas (8), Willett (3), Koepka (1), Holmes (1)
Last group out
A tremendous roar greets Shane Lowry as he and Tommy Fleetwood stagger their entrances on to the first tee box and shake hands.
Lowry is patently enjoying himself, flashing smiles at everyone.
Ahead, JB Holmes did a Fowler off the first tee and flayed it out of bounds to the left. He has to have another go and is staring down the barrel of a double bogey.
Holmes' funereal pace and travails hold up the final two. Fleetwood has the honour . He opts for an iron off the tee and hits it safely and sweetly up the middle. Lowry plays safe with an iron and though he hooks it left into the rough, it is in bounds.
Oh dear - spoke too soon. Westwood's 5ft par putt at the first horseshoes out and he drops a stroke to -7 , just like Stenson. Willett makes his putt, though, and stays on seven-under.
Rickie Fowler is in deep shtuck off the first tee, hitting it out of bounds down the left.
Spieth's tee shot at three is another wild one. His short-game has saved him all week, all year.
Fowler drops two strokes at the first, missing his 8ft bogey putt.
Spieth's hot putter
Up on the second green Jordan Spieth sweeps in an 18ft birdie putt to move up to -8 and one hole back Westwood and Willett both lag up close enough to be confident of making pars.
The two Ws
Willett and Westwood tee off their fourth rounds, Yorks v Notts. Both begin with solid efforts, Willett in the first cut up the left, Westwood up the middle. Willett hits his second stroke to the right of the green, hoping for it to come back on the wind but it sticks to the ridge. Both leave themselves about 50ft for birdie.
Jon Rahm does, indeed, have to settle for a double bogey. He falls back to five-under.
Justin Thomas has made three birdies in succession at three, four and five, to take a share of eighth place at seven-under.
Rahm in a spot of bother
Spieth scrambles par on the first, Stenson, who was far-betetr placed after his opening two shots, makes a bogey to drop back to five-under.
Jon Rahm, using a driver for the first time off the 1st tee this week, finds the fairway bunker. His playing partner Tony Finau is in the rough further back on the left.
Bob MacIntyre rattles in another birdie on 10, his third of the round, and he is now five-under.
Rahm's bunker shot is a stinker, taking on the steep bank and thinning it. He will have to have another go. Taking the driver means that bunker bang in the heart of the fairway set 300 yards is a genuine hazard. He does chip out and leaves himself about 130 yards to the pin for his fourth shot at the par-four.
Lowry limbers up
The leader looks super-relaxed as he heads to the range.
Spieth's second to the first, difficult lie, is thrashed to the left and skids into the greenside bunker. Tough hole, this one, playing third-most difficult so far today. Stenson's second catches the wind and flies over the pin and into the rough on the ridge protecting the valley of the green. He'll have a pitch back into the wind which should help him stick the ball close to the pin.
Walks up the last to a resounding reception, having picked up another stroke at 17 to climb to -3. Henrik Stenson and Jordan Spieth are on the first tee, the two champions who immediately preceded Molinari in 2016 and 2017 respectively.
Stenson drives safely, taking a left-to right ride on the breeze, to the fairway. Spieth is too far right, in the rough, unfortunately a few yards shy of some cabbage advantageously trampled down by the galleries.
Molinari drains his par putt to sign for a blemish free 66.
Has started encouragingly with birdies at the second and fourth. and is now four-under with 13 to play, having slid his birdie putt on five to the right from 8ft. Bob MacIntyre has made two birdies in his first eight holes and is four-under. He stood up to Kyle Stanley on Friday over poor etiquette and is standing up to the wind today.
We begin coverage of the fourth round of The Open from Royal Portrush with the leading 18 golfers about to begin their final 18 holes.
Because of the incoming storms, tee times have been brought forward to the following:
12.27 Xander Schauffele (USA), Cameron Smith (Aus)
12.37 Dylan Frittelli (Rsa), Andrew Putnam (USA)
1247 Alex Noren (Swe), Matt Kuchar (USA)
12.57 Henrik Stenson (Swe), Jordan Spieth (USA)
13.07 Tony Finau (USA), Jon Rahm (Spa)
13.17 Danny Willett, Lee Westwood
13.27 Justin Rose, Rickie Fowler (USA)
13.37 JB Holmes (USA), Brooks Koepka (USA)
13.47 Tommy Fleetwood, Shane Lowry
And the top places on the leaderboard have not been seriously challenged by this morning's play. Hertfordshire's Tom Lewis, twice winner of the Portuguese Masters, has moved up to four-under with two birdies from his last two holes, four and five, and defending champion, Francesco Molinari, added to his two-under front nine with and eagle at the 12th, to be four-under for today and -2 for the tournament with three to play, 14 strokes behind Lowry on -16.
Those final nine pairs currently stand like this:
-9 Koepka, Rose
-8 Fowler, Westwood
-7 Willett, Rahm, Finau, Spieth
-6 Stenson, Noren, Kuchar, Frittelli, Putnam, Smith