Lydia Ko is desperate now. She needs to pick up shots and fast after her double bogey. She has a lengthy birdie putt at 13 and criminally leaves it short. Only the brave and bold will be rewarded. Especially with Ko so strong. She has just parred 11 to stay at 12 under.

Maureen Madill
BBC TV on-the-course commentator

"The 12th hole is causing a couple of difficulties. Lydia Ko dropped two shots, both Melissa Reid and Minjee Lee dropped one."

Inbee Park sinks her par putt and remains three off the lead with six to play.

A lovely chip to within four feet from Inbee Park at 12 gives her chance to salvage a par. She will take that considering her tee shot, but she needs more if she is to to keep up the pursuit of Ko.

A shot dropped for Pettersen at 11. That is consecutive bogeys for the Norwegian and she is five off Ko, who looks like the only woman who actually wants to win this at the moment.

Maureen Madill
BBC TV on-the-course commentator

"Inbee Park and Ko Jin-young share the same management company. Park is something of an idol for Ko, she has been mentoring her young countrywoman. It's quite ironic Ko stands between her and a seventh major."

Image source, Getty Images

Inbee Park is through the back of the 12th green with her second shot from the rough. I wonder if she is starting to regret all the help and advice she has been dishing out to fellow South Korean Ko Jin-young of late?

Peter Alliss
BBC Sport commentator

"Ko Jin-young looking very good indeed, so calm, so controlled. But there's still a few holes to go."

Inbee Park gets a bit of luck as a drain cover gives her a free drop into much better lie. Still in he rough but nowhere near as bad. She needed that luck as well as Ko Jin-young is looking increasingly unstoppable. Another birdie at 10 takes her to 12 under and a three-shot lead over the world number one.

Inbee Park is in bother at 12. She is deep in the rough after her tee shot. Ko confirms her double bogey on the same hole. The 18-year-old's hopes of becoming the youngest women's major winner in history are fading fast.

Andrew Cotter
BBC Sport commentator

"We're seeing the trials and tribulations of all the others, but the leader Ko Jin-young is fairly serene."

Ko's chipped fifth shot at the par-four 12th leaves her a few feet from the pin. At the very least she is looking at a double bogey now, that will take her back to six under and five off the lead.

Lydia Ko has a swine of a lie at 12. She is buried deep in the green-side bunker. She takes a big swing at it but fails to beat the lip, landing in an even worse position back in the sand. She'll have to take a step back up the fairway to go forward. This could see her challenge fade. She is eight under but she won't be staying that way.

This is a big putt for Inbee Park. It is to save par on the 11th. She makes light work of the eight feet between ball and hole and sinks it to remain two off Ko.

Leader Ko Jin-young saves par at nine with a putt from eight feet. More frustration for Pettersen with the putter as she leaves her effort 10 feet an inch shy of the target and bogeys the 10th. Back to eight under she goes.

Wales' Amy Boulden was nicely placed at three under at the start of the round but so far she has only improved her score by one. She comes agonisingly close to a birdie at 12 but pushes her putt just an inch past from about 12 feet.

Here comes the rain. The brollies are up and faces become increasingly gloomy amongst the brave souls in attendance at Turnberry. You really can't beat a British summer.

Peter Alliss
BBC Sport commentator

"What a bonus that is, from all of 10 or 12 yards. It was travelling a bit too, but Inbee Park gobbled it up."