The Sahalee Country Club course is throwing up plenty of challenges for New Zealand golfer Lydia Ko as she chases her third successive major title.
Ko has a one-shot lead heading into the final round of the second women's golf major of the year, the Women's PGA championship in Washington.
Ko is two under par for the tournament after posting a one under par 70 third round, and said it had been a hard grind at the Sahalee Country Club.
"I'm just focusing on that shot I have in front of me and not worry about what could happen and what might happen."
"We've been trying to stay patient and there are some par 5s that are reachable so you know those holes you're trying to go for it a little bit more and try and grab the birdies. But you just need to play safe at the same time but then when it does give you that chance you can try and go for it."
It is the first time the world number one has held the 54-hole lead in a major championship.
Americans Gerina Piller and Brittany Lincicome were one shot back.
Ko is chasing her third successive major near Seattle, after winning her first at the Evian Championship in France last year and this year's ANA Inspiration in California.
"You know, I'm happy with my position. I didn't really know how it finished up, because I didn't get to see what the last group finished up. But obviously I've got to be happy with it. And I've just got to stay positive," said Ko.
"It seems like the girls, they're playing really well, and they're playing consistent. I've just got to focus on my game.
"I can't control what the other girls are doing. So just try my best out there. We've still got a long 18 holes to go. You just never know what's going to happen until the winner's putt drops on the last hole."