Image source, AP

Hoffman bogeys 15, drops back to -10. Spieth taps in for birdie, is 17 under again...

Image source, AP

Dustin up the slope at 16 and that's pretty well paced, he's got a tap-in for par. Mickelson with 174 yards left at 17... he's left himself a horror of a putt and might even have to get a wedge out to cut off the corner.

Andrew Magee
American PGA Tour winner on BBC Radio 5 live

"The peloton has got some more fuel in their Gatorade and they're keeping the pressure on Spieth. One more birdie for Phil Mickelson and that would be a sublime day for him."

Mickelson will fancy his chances if he can keep Spieth in reach with a birdie on one of the two closing par fours. He's done it before don't forget, coming from one behind Lee Westwood in 2010 to clinch his third Green Jacket in spectacular fashion by shooting a final-round, five-under 67.

Paul Azinger
Former United States Ryder Cup captain and BBC expert

"He caught it so nice, perfectly judged. He had his arms up before it went in and now he has Jordan Spieth in his sights."

Image source, AFP

Rose finds sand at 16. Dustin birdied 15 to get back to -8 but his tee shot at 16 falls away from the pin. Mickelson misses the fairway at 17 but he looks in reasonable shape. Streelman in with a third straight 70 for six under par. ROSE SPLASHES IN AT 16! Simply magnificent, four straight birdies for the 2013 US Open champion, he's 11 under.

Image source, AFP

Rose makes a bird on 15, is -10 and six off the lead. Spieth shows just how big his cohones are - straight at the flag at 15, just about clambers over the water and he's got 25 feet for eagle. Hoffman, I believe, is swimming.

Paul Azinger
Former United States Ryder Cup captain and BBC expert

"That really ramps up the pressure on Spieth's second shot on the 15th. No reaction from Jordan when he hears the cheers. He has to know that was Mickelson."

Image source, EPA

Casey at the par-three 16th, he's over with Phil in the hollow. Hoffman pings one down the left on 15, Spieth goes straight down the middle. What a putt that is from Dustin Johnson, cozying his ball to within a couple of feet at 15. And here's Phil on 16... DRAINED A BIGGUN! Lefty gets to -12, is outright second and four off the lead. That's some racket from the patrons - and Spieth will know that's no ordinary racket, that's a Mickelson racket.

Image source, Getty Images

Par for Hoffman at 14, he's going nowhere. Mickelson on 16, 160 yards, nine iron, dribbles away into the hollow. Spieth blinks - tugs his par putt left, falls back to -16 and five clear of playing partner Hoffman. For the record, the 54-hole record at Augusta is -16, set by Tiger Woods in 1997.

Spieth leads by five

-16 Spieth (US) 14

-11 Mickelson (US) 15, Hoffman (US) 14

-9 Rose (Eng) 14

-7 Streelman (US) 16, Casey (Eng) 15, D. Johnson (US) 14

-6 McIlroy (NI), Woods (US)

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

Peter Alliss
BBC Sport commentator

"Still these two talk away, trying to find the mystical magic of how you hit a drive straight and keep your balance and be kind to your old granny..."

Image source, Getty Images

Spieth at 14... 157 yards, into the heart, decent. Casey races his three-foot birdie putt about five feet past at 15 but saves par coming back to remain -7. Mickelson holes his two-foot birdie putt, is -11 and six off the lead.

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Rose slams one down the 15th, he's in a rich vein off the tee. Dustin made eagle here yesterday but I don't think he'll be doing that today, he might have to lay up with his second after coming to rest down the left of the fairway behind some trees. Casey with a magnificent recovery at 15.

Jay Townsend
Former American professional golfer on BBC Radio 5 live

"That putt from Spieth never looked like it was going anywhere else. He has great speed with his putting. But there's one thing about Augusta National... the fat lady never gets warm early."

Jason Day in with a 71 for -4. Els for bogey at 15, from about eight feet... starts right, stays right, he drops to -4. Hoffman and Spieth safely away at 14, Casey's approach at 15 is so overcooked it's almost cremated.

Peter Alliss
BBC Sport commentator

"The baby-faced killer. It is absolutely marvellous to see his composure, a little smile occasionally. He has had 20 birdies so far and a few more holes to go."

Just the 20 birdies this week for Jordan Spieth, only five short of Phil Mickelson's record for four days.

Image source, AFP

Spieth stalks his ball, takes aim and bends in his birdie putt on 13, moves to -17 and leads by six. The kid's doing alright, it's in danger of turning into a procession. Rose jabs in his birdie putt from just off the green at 14, moves to nine under.

Andy in Portsmouth: My daughter just asked, "Daddy, in golf, when it goes close, do you do a squat?" Fabulous. Just want a glass of wine and some peace but am now explaining the ENTIRE rules of golf.