In Gee Chun was four strokes behind fellow Korean Amy Yang entering the final round of the 2015 U.S. Women's Open at Lancaster (Pa.) Country Club. What followed was a historic performance by one of golf's newest stars.

The United States Golf Association (USGA) conducts many of golf's most prestigious championships, highlighted by the U.S. Open, the U.S. Women's Open and the world’s premier amateur championships. Based in Liberty Corner, N.J., the USGA governs the game in the U.S., its territories and Mexico.

To learn more about the USGA, visit http://www.usga.org.

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