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Jordan Spieth on the fifth... whacks it 263 yards, slightly to the left. Nothing to be concerned about. Elsewhere, the horrible par-four 10th has just claimed a bit of Charl Schwartzel's soul. He double bogeys and drops back to two under.

Tom Fordyce
Chief sports writer at Augusta

And look what comes next for Spieth?

What: 455-yard par four

Why: Uphill, dog-leg left, with 315-yard carry required to clear bunkers. Tiny safe area to find on green.

Jordan Spieth with a knee-knocking two-and-a-half putt for what would be a bogey on the par-three fourth. The patrons are silent, all eyes on the leader. Has he enough grit for guts? The Texan holds firm, sinks it, but drops a shot and returns to 14 under. On to the fifth hole he goes.

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A ripple of applause on the the sixth and it can only be for one man - the pink-shirted blue eyed Phil Mickelson, everyone's favourite lefty, unless your name is Tom Watson. A crackerjack of a tee shot sees him on the green on the par three. But, hang on, Jordan Spieth IS ABOUT TO DROP A SHOT!!

Rory McIlroy has engineered a birdie chance on the 13th. A fabulous 189-yard approach shot onto the green, followed up by a well-timed mammoth putt along the dancefloor gives him an opportunity to tap in from three feet. The world number one makes it look easy and he's now up to fifth.

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We asked for your vote earlier on which player will surge up the leaderboard to pressure Jordan Spieth.

The vote is now closed and you have spoken, Rory McIlroy is the man you see mounting a challenge, earning 23.3% of the votes.

McIlory made the turn in 32, his lowest front nine score at the Masters. The man is on fire.

-15 Spieth (US) 3

-9 Mickelson (US) 4, Hoffman (US) 3

-8 P Casey (Eng) 4

-7 D Johnson (US) 4

-6 McIlroy (NI) 12, Woods (US) 10, Streelman (US) 6, Rose (Eng) 4

Selected others: -4 Poulter (Eng); -3 Garcia (Spa) 10, Scott (Aus) 8; -1 Fowler (US), B. Watson (US) 12

Silence on the 10th green as Tiger Woods prepares for a birdie chance. A gentle tap... right to left... but the ball comes to a stop just short of the hole. Nevermind. Let's see how Phil Mickelson is doing. A decent approach shot onto the green, but he undercooks his putt for birdie. We go again.

Image source, Joey barton Twitter

Joey Barton is tuned in and fills us all in on Twitter. , externalWe are on BBC Two right now and BBC Radio 5 live will be teeming with conversation live from Augusta from 21:00. You can also tune in on connected TV, mobile phone app and games consoles.

Our Amen corner coverage on red button starts at 21:20 after the National Lottery.

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Some context on just how well Jordan Spieth is performing. The 54-hole scoring record at the Masters is 15 under. Jordan Spieth, if you didn't know, is currently 15 under. Only five of 78 champions have had a score of -16 or better.

Jordan Spieth sinks onto his calves as he watches a birdie putt on the par-four third curl a pimple long of the cup. The 21-year-old is open mouthed. There's no need for him to tell us that was close, his body language says it all.

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I've not mentioned Ernie Els, but I will. The Big Easy started his round with a bogey, but has just made amends with a birdie on the fourth. The South African back to five under for the tournament. And there's some splishing and splashing on the 11th as debutant Danny Willett, who was ticking along nicely at one under, goes into the drink.

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American Rickie Fowler, who double bogeyed the 18th to sit one under for the tournament, but at one point was four-under says: "I'd say five under or six is a pretty solid round out there today. Seven or eight isn't out of the question."

Look over your shoulder, Jordan, there's a Lefty creeping up behind you and he has history on this course. A third successive birdie for Phil Mickelson sees him leap to -9 for the tournament. Mickelson through four and up to second.

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Justin Rose on the third, a lengthy birdie chance for the Englishman - left to right - but a touch too much adrenaline on that putt and the ball rolls over the cup. Dustin Johnson with a birdie on the second. And, on the ninth, Tiger Woods is punching the air - down the hole his putt goes for par.

Jordan Spieth take note, four of the last five Masters champions did not take a lead into the final round.

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But for fans of Spieth, take comfort in the fact your man is more than decent from the front. He wrapped up 2014 with a six-shot win at the Emirates Australian Open and a 10-stroke cruise to the Hero World Challenge.

And so it begins. Jordan Spieth sinks a birdie on the second and the 21-year-old, with the composure of a multiple major winner, moves to 15 under, extending his lead to six shots.

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England's Ian Poulter, after shooting a five-under 67 to sit four under par and take the clubhouse lead: "I didn't miss the greens like I did the first couple of days. I played exceptionally well and today was about not missing greens.

"I thought I was going to go 18 greens in regulation which would have been a first but I missed at 18. 67 was nice but it could have been a couple lower. The greens aren't going to dry out too much more and some of the pins are accessible today."

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The patrons groan in unison as Rory McIlroy misjudges his putt on the 11th. A birdie chance gone, gone, gone, and the world number one settles for a par.

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Lefty's in the house! Phil Mickelson sneaks to eight under while the majority of us were focusing on Rory McIlroy and Tiger Woods. Birdie, Birdie for the three-time champion - on the second and third -a simple tap-in and he walks away from the shortish par-four third with a bounce in his step.