South Korea's Lee Kyoung Hoon outplayed compatriot and overnight co-leader Kim Hyung Sung to capture his first title in Japan at the Shigeo Nagashima Invitational on Sunday.
The 20-year-old rookie fired eight birdies and a lone bogey en-route to a final-round 65 at The North Country Golf Club in Hokkaido, beating Kim by two shots to finish at 19-under 269 and take the 30 million yen winner's check.
"This is my first win since turning pro and I am really happy. I doubt I'll be able to sleep tonight," said Lee who pulled away to win with birdies at the 17th and 18th and moved into second on the money list.
"In a good sense playing in the same group as my senior Kim Hyung Sung motivated both of us and helped me improve my score. I feel I am going to get better with each tournament," he added.
Ryo Ishikawa (66), teeing off in a tie 10th place, briefly moved within two shots of the lead after a making four birdies on the front nine, but eventually finished four shots back in a share of third with Katsumasa Miyamoto (68), South Korea's Lee Dong Hwan (66) and Taichi Teshima (67), who aced the 12th hole.
South Korean Cho Min Gyu, China's Wu Ashun and Yasuharu Imano shared seventh place.