Amy Yang edged Ha Na Jang on Sunday for the final spot on South Korea's UL International Crown team for the July 22-24 event at the Merit Club in Illinois.
The four-player rosters were set at the end of the KPMG Women's PGA Championship, while the eight countries were determined after the ANA Inspiration in early April.
Yang will join Inbee Park, Sei Young Kim and In Gee Chun in South Korea's lineup. Yang was seventh Sunday in the major championship, and Jang tied for 30th.
Lexi Thompson, Stacy Lewis, Gerina Piller and Cristie Kerr will represent the United States.
Porani Chutichai took the final spot for Thailand, joining sisters Ariya and Moriya Jutanugarn and Pornanong Phatlum.