South Korean golfer Se Ri Pak has withdrawn from the U.S. Women's Open for an undisclosed reason. The USGA event is scheduled for July 9 to 12 at the Lancaster Country Club Course in south-central Pennsylvania.

Pak, who is considered a revolutionary figure in South Korean golf, will be replaced by alternate Georgia Hall of Britain, according to multiple reports from ESPNYahoo News and other sources.

Pak also withdrew from the KPMG Women’s PGA Championship on Friday due to an illness, but it is unknown whether the Lancaster withdrawal is linked to the same illness.

The 37-year-old South Korean, who turned pro in 1996, has had a long and illustrious golf career that has included Women’s PGA Championship titles in 1998, 2002 and 2006 and the U.S Women’s Open title in 1998. She also won the Women’s British Open in 2011 and is a member of the Women's Golf Hall of Fame.