Inbee Park's bid to make history is hanging in the balance after she fell eight shots back at the halfway mark of the Ricoh Women's British Open.
Park, seeking to become the first player - male or female - to win four professional major championships in the same year, could only add a 73 to her opening 69 on the Old Course at St Andrews.
That left the 25-year-old from Seoul two under par, eight shots adrift of compatriot Na Yeon Choi who mastered the strong winds which made life difficult for the later starters.
Choi carded a second consecutive 67 to finish 10 under par, one shot ahead of Japan's Miki Saiki with American Morgan Pressel another stroke back.
Park, who would have been even further behind if not for making a birdie on the 18th for the second day running, told reporters: "A little bit of everything wasn't really working well out there today, but it was tough conditions. I think I grinded (it out) really well out there.
"I was a little bit unlucky with the draw, getting afternoon today, not playing in the morning when it's lovely, but that's the way it is."
Leader Choi, who won the US Women's Open last year, said: "The weather wasn't good, the conditions were very difficult.
"It was like it was par 74, 75 today. So I didn't care if it was a par three, par four, par five. I just played one shot at a time. I don't think I could have shot lower than 67."
Pressel certainly got her course management right as she carded a flawless round, adding: "I played very well today and didn't really put myself in any trouble. I only had one par putt of maybe about six or seven feet on 11, the rest were tap-ins. I missed a lot of birdie putts out there.
"I gave myself a lot of chances and they were scaring the hole but just didn't go in. On the last hole I was ready to give a big fist-pump because the birdie putt was in the middle of the hole but it lipped out on the low side."
Norway's Suzann Pettersen is just three off the lead after a 67 with Scotland's Catriona Matthew leading the home challenge on two under after a 74.
Pettersen said: "I'm very happy with this round. I got off to a fairly quick start, gave myself plenty of chances and don't feel like I left anything out there really.
"The finishing stretch is quite a few tough holes, so if you want to play smart you're still leaving yourself a lot of long approaches. I think it's just hard to hit them close.
"I've just got to go out and keep doing what I'm doing, giving myself a lot of great chances, playing smart, trying to play to my strengths and not really take too many risks being greedy off the tee. So far it's paid off."