Vicki Thompson:, external Get heartrate monitors on these golfers, mines up and down like a car alarm, and I'm not even playing.

Simon Loughins:, external It's gone too far when players have to putt with their backs to the holes.

Jordan Spieth meanwhile sticks his tee shot into a thicket of pines. What's his view like from there? It can't be too clever.

Meanwhile Ian Poulter's tournament is all over. He is done and dusted on two over.

Ken Brown
BBC Sport commentator

"Hold onto your hats... woah, that's enormous. He won't have much more than a wedge."

They will be picking that one up on radar somewhere on Arlington Avenue. Bubba Watson middles his drive on 13th, ripping it round the corner and so close to the green that he can almost see the Masters logo on the flag.

Par five, 510 yards

Reachable in two, but those who fall short run the risk of slipping into the water at the front of the green. Go long, and four bunkers wait behind. The putting surface is four-tiered and having to three-putt is a real danger. It was from the trees and pine straw on the right of the fairway that Phil Mickelson produced a moment of magic on the way to the Green Jacket in 2010.

2013 average: 4.75 Rank: 15

Image source, Getty Images

Jordan Spieth keeps the gremlins at bay and minimises the damage as he makes a slick bogey putt. He slips back to five under. Bubba Watson keeps his nose clean, a routine par and his advantage cranks open to two shots.

Defending champion Adam Scott, readying himself for the jacket ceremony after a final-round 72 to finish +1 overall: "It's a tough one obviously, I've just seen Jordan's shot on 12. It's all in Bubba's hands at the moment, lots can happen it always does.

"It's been an amazing week for me but yesterday was very disappointing. I left too much work to do today. I didn't quite have my pace on the greens this week, that's where I lost my shots."

Jordan Spieth drops back on his line after finding the drink on 12. Massive pressure bearing down on him. If his third shot goes the same way that might be his challenge over. But he lands it up on the dancefloor and might just save bogey.

Watson is making hay while his opponent struggles, nudging a little iron to within five feet.

Miguel Angel Jimenez pushes a putt right of target on the 13th, with commentator Ken Brown willing him not to aim too far right. "Everybody does that," says Brown.

The put drifts by and co-commentator Paul Azinger says: "You know it, I know it, but you and I would still stand on that green, line it up and still put it to the right."

Matt Kuchar finds his ball and he is one lucky, lucky boy. His ball has come to rest on solid ground and he hacks out from the reeds on the side of the 13th fairway. He is back on the fairway but is going to take some punishment when the reckoning comes on the green.

Ken Brown
BBC Sport commentator

"What a day it's been for Jordan Spieth, though it hasn't gone all his way. Emotion, passion, nerve. As Arnie (Palmer) said you've got to keep thinking."

Jay Townsend
BBC Radio 5 live summariser

"You just can't do that. It is a terrible, terrible error by Jordan Spieth. People have got their faces in their hands 'Oh my good, what are you doing?' they are saying."

Jordan Spieth! You are killing us here. His tee-shot on 12 lands on the downslope at the front of the green and is sucked into the watery depths by gravity. Is that the moment that Bubba Watson escapes his clutches? Watson plonks his opening offer safe and sound on the back edge of the green.

On the tee at the par-five 13th and Matt Kuchar looks like he's setting this out way right, trying to draw it round the corner but that's an awful duck hook straight into the water hazard that runs down the left-side of the fairway. Is that the end for the American?

Paul Azinger
Former United States Ryder Cup captain on BBC TV

"Kuchar and Blixt are still in this. There are the two par fives on 13 and 15 coming up and the ball feeds down to the flag on 16 and 18 isn't that difficult."

Matt Kuchar and Jonas Blixt are hanging tough. Both have taken pars off 12 and are looking steady as metronomes.

Paul Azinger
Former United States Ryder Cup captain on BBC TV

"He's starting to show a little emotion is Spieth, maybe getting a little impatient."

Jordan Spieth leaves his birdie putt on the south side of the hole. Just shaving the rim. Bubba Watson taps in a gimme and both head up towards 12.

Paul Azinger
Former United States Ryder Cup captain on BBC TV

"The 12th... this hole'll get your heart racing."

Bubba Watson to putt first on the 11th green and that is up close enough to make a near-certainty of his par. Jordan Spieth will be hoping to go one better.