The 30-year-old Japanese triumphed by three from countryman Yuta Sugiura at Meishin Yokaichi Country Club, Shiga Prefecture on Sunday.
Hataji started the final round one off the lead but came through with a three-under-par 67 to finish with a winning total of 14-under 266. He overcame a poor start, that saw him make bogeys on three and four, with a strong four-under-par back nine when he made back-to-back birdies twice.
It made amends for finishing runner-up in the same tournament last year and added to what is far and away the most successful season of his 10-year career.
In March he won New Zealand’s National Open to become the first player from his country to raise the trophy. He beat Australia’s Hend by a shot after making key birdies down the stretch before Hend three putted 18.
