Han Lee fired a 9-under 63 on Sunday and that helped him come from behind to win the Mynavi ABC Championship.
Lee finished at 17-under-par 271. He won for the first time on the Japan Golf Tour.
The 35-year-old dropped in back-to-back birdie efforts four separate times in his round. Lee closed his bogey-free round with his fourth birdie in four days at the par-5 18th.
Katsumasa Miyamoto closed with a 68 to take second at minus-16. Third-round leader Kyung-Tae Kim managed a 2-under 70, but that left him tied for third with Kaname Yokoo (68) at 15-under-par 273.
Last week's winner Toru Taniguchi also shot 70 to finish tied for ninth at 10- under-par 278.