
In the fourth and final round of the championship in Midland, Michigan, the South Korean pair finished at 20-under 260, leading to a playoff in which they birdied the first hole to beat the American team of Megan Khang and Lexi Thompson.
Another South Korean team, Park Sung-hyun and Yoon Ina, tied for fourth at 11-under.
With Sunday's victory, Im and Lee, both in their second year on the LPGA Tour, became the first South Koreans to win the championship, which was first held in 2019 as a unique four-day tournament where players team up in pairs to compete with varied formats.
Their feat also brought South Korea's tally of LPGA victories this season to four, after Kim A-lim, who captured the season opener by winning the Hilton Grand Vacations Tournament of Champions in Florida in February; Kim Hyo-joo, who won the Ford Championship in Arizona in April; and Ryu Hae-ran, who claimed the Black Desert Championship in Utah the following month.
Im and Lee each took home a winning purse of $399,510.
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