Local favourite Yuto Katsuragawa started the day three shots behind the lead but has won his first DP World Tour title in style carding a bogey-free 63 on Sunday to win the ISPS HANDA Championship by three shots at 17-under.
"This is the tournament I wanted to win the most this year. I was very nervous on the back nine, my hands were shaking but I trusted myself and I managed to bring my golf.
"I have been practising a lot to stand on the big stage. I can now go on the DP World Tour which is really great and I'm really happy with it. I'm aiming to become a member of the PGA TOUR in the future.
"Basically, I embrace enjoying myself. Only a few pro golfers can travel abroad, so I want to travel a lot, enjoy myself, and play on many courses. I also hope to be a role model for children and juniors by becoming an international golfer."
Sweden's Sebastian Söderberg shot a 67 featuring five birdies and two bogeys to finish second at 14-under.
Japan's Ryosuke Kinoshita closed with a 69 for a share of third place at 12-under alongside Spain Ivan Cantero (68), Germany's Marcel Schneider (68) and South Africa's Christiaan Bezuidenhout (bogey-free, 65).
