World number four Jessica Pegula claimed her second title of the season with victory over China's Yue Yuan in the Korea Open final in Seoul.
The 29-year-old won 6-2 6-3 in Sunday's final for her fourth career victory.
Pegula, who was seeded first after accepting a wildcard in Korea, became the first American since Venus Williams in 2007 to win the title.
"My mom is Korean and she was adopted from here so it's really special to be able to win here," she said.
Pegula, who won the Canadian Open in Montreal in August, also reached the finals in Doha in February and Tokyo, where she lost to Veronika Kudermetova this month.