Our front runners find a wee bit of trouble on 15. Jason Day turns his shot over and it goes left, Matt Jones is a little short. Good up and downs needed for par and then they'll roll onto a par five next where their positions can be strengthened.

"Turn left. You gotta turn left..."

Jordan Spieth talks to his ball more than any other player. Perhaps it's a measure of how good he is that the object flying at pace listens to him more often than not.

This tee shot on 17 indeed turns left and swings into the green to leave a makeable birdie putt.

Jordan Spieth for eagle... no joy. A good birdie though on 16. He had to nail that par five as other around him make their push for glory.

This champion ain't done yet.

Jordan Spieth has kept a low profile today, it's not his fault, he's actually flying on four under for his round but others are just finding another gear.

Spieth though has an eagle putt on 16 after a long approach takes a nice kick in his favour. We'll bring you the putt when he makes the long walk up to the dance floor.

Perhaps Jason Day and Matt Jones can sense Spieth is up to something, birdies for the pair on 14. What else did you expect?

Jay Townsend
Former American professional golfer on BBC Radio 5 live sports extra

"Right now, Day has the chance to eliminate most of his challengers. He just looks like he's so on."

Bogey doesn't exist. Par doesn't exist. Only birdie does. Jason Day is a man on a mission, he's bullying Whistling Straits.

From 109 yards he cracks a stunner to within a few feet. No one can live with him and if we're not careful, he may be sleeping on a four or five shot lead tonight.

Image source, Getty Images

Justin Rose just can't switch off the after burners and he's going just one way on this leaderboard.

Solid as a rock - he sinks a birdie putt to reach a dozen under par. Remember Rose made double-bogey on six so he's really dug in to excel.

And a round of applause for the sunglasses if nothing else.

Branden Grace reacts to his round of 64 and playing partner Martin Kaymer's 65: "It was a good day from the start, we both ripped it down the first and we fed off eachother a little bit. Martin made great putts and I managed to make some birdies out there.

On his hole out from the bunker on 18: "It was one of the best bunker shots I've ever played in my life."

Can you draw on going close at the US Open at Chambers Bay? "Today was a great day to give myself the chance. There's a lot of golf for the guys behind me to be played but Chambers Bay has some great memories and I know what to do."

Jason Day... a big, big play as he judges his birdie putt perfectly and that ladies and gents is a two-shot lead on Matt Jones, who can only bank par.

Day is now six under today through 13 holes. The Australian is driving the ball on average around 307 yards and has found seven of 10 fairways. It's relentless stuff and it looks more and more like being his time at last.

Image source, Getty Images

Thanks Ben, this is Luke Reddy taking you into Sunday. Can Jason Day or Matt Jones take this tournament away from the field late on?

They both create outside birdie chances on 13 with solid wedges into the green as Tony Finau moves to within two - stroking in from a few feet on 14.

There's no stopping Justin Rose, he has the laser fixed on pins right now - back spin leaves 10 feet for birdie on 14. What quality we are seeing here.

Rose's drive at 15 finds the short stuff and gives himself the ideal angle in. It's a high quality and multi-national leaderboard, we'll have Aussies, South Africans, Germans, Indians and Americans all vying for the title come Sunday.

Day at 13, going with a hybrid. Perfect, pinned to the right side of the fairway. Rose misses with his birdie attempt at 14, the Englishman stays 11 under. Jones finds light rough with his tee shot at 13.

Finau should get that shot back he just chucked away at 13, he's stuck his second at 14 to within three feet. Dustin Johnson is stalking through the field, he's just made another birdie at 16 to get to nine under. Dustin's not quite dead yet.

Jay Townsend
Former American professional golfer on BBC Radio 5 live sports extra

"That was an opportunity missed for sure. I don't think he went to school on watching his playing companion shoot with a break from right to left. But it's another par in the book. He's now got a short hole coming up on 13 which he will be able to attack with a good tee shot."

Jones with that long birdie putt at 12, his judgement of pace has been beautiful today and he taps in for par to stay -13. Day has had five straight one-putts but he can't make it six, he stays -14 and one clear of the field.

Finau leaves his par putt short at 13 and drops to -11. Day at the par-three 12th and he's got another chance for birdie. Jones going with pitching wedge and he doesn't make it up the slope, leaves himself a 30-footer. Spieth with his second at 14, coming in blind, and he's tugged it slightly. His birdie putt is right on line but doesn't have enough steam, he stays -10.

Day makes that eagle putt disappear at 11, he's the outright leader on 14 under. After so many near misses, could this finally be Day's major?

Rose has got a four-footer for par at 12 and he makes it disappear to stay -11. Jones back as outright leader after birdie at 11 but Day has an eagle opportunity, which could see him leapfrog his playing partner. Finau with his rollercoaster putt at 13 and he hasn't got it over the crest...