Triple-defending champion Inbee Park is determined to play out her attempt at a fourth Women's PGA Championship, despite carrying an injury to Sahalee Country Club this week.
Park enters the competition looking to become the first woman, and only third player ever, to win a major tournament four years in succession.
However, ligament damage to her left thumb is likely to severely hamper the world number two's efforts in Washington.
Park's last outing at the Volvik Championship ended in withdrawal after shooting a 12-over 84, but the South Korean superstar is not giving up.
"It's just an unreal opportunity, and that's why I really wanted to play this week," Park told espnW.com.
"I know I'm injured. I know I might not be able to play the full [tournament]. But I didn't want to miss the opportunity. I'm going to try hard to play as long as I can play."
Park said of her injury: "It's not exactly torn, but in the stage just before a tear.
"It's inflamed and strained. It's not like back pain, where I can't move from the bed. But when I try to make certain movements in the swing, it hurts. I feel like I'm fine, but some movements are restricted.
"This thumb injury is different from the back injury. It's a very small part of my body but it's bothering me enough that it affects my game."
World number one Lydia Ko and third-ranked Lexi Thompson will play alongside Stacy Lewis - seventh in the world - on day one.
Ko has won the last two LPGA majors and said of her chances: "I am going to play my own game, hit that one shot at a time and have fun. And I think that's the key thing. When I think about it as, hey, this is a major, everyone wants to play well at a major, I think there's just too much pressure."