Kosaku Shimada, the head of the Japan Tour, sent a letter of congratulations to the American within a couple of hours of his triumph.
He wrote: "I believe he had a hard time in a foreign country but he overcame it by winning four tournaments last year. Omedeto [ congratulations] Todd Hamilton."
Asked if he would be now become a massive star in Japan, Hamilton said: "I don't know. I hope they appreciated the time I spent over there playing. I am going to try to go back in November for a couple of tournaments. I hope they give me a good reception."
Japan is a country with a huge appetite for golf. Many cities have multi-tiered driving ranges and most manufacturers are keen to tap the lucrative market for equipment.
Once successful in Japan, firms are keen to take their products to other expanding markets in Asia, especially China and South Korea.
Having played on the Asian Tour and won tournaments such as the Korea and Thailand Opens, Hamilton should be in a perfect position for sponsorship deals.
Using a second-hand putter he bought for $50 (£27) back home, Hamilton made more than $ 1million (£530,000) in prize money from his last year in Japan in 2003 after first joining the tour there in 1992.
He was able to fund a house for his wife and three children in America and put cash away for his children's college education. The American is not a man for flash living.
He said: "I made a very decent living. I've had the chance to buy a lot of nice stuff. As long as I have a halfway decent car, a nice place to live and a set of clubs, I'm fine."
Yesterday's victory will obviously take his potential earnings to a completely different level.
But Hamilton will need to produce better form than Curtis, who has struggled since last year's tournament in Sandwich and missed the cut in Troon.
For now, he admits he is not sure how the victory will change his life.
He said: "Right now, I have no idea what's in store. I'm sure I won't get much sleep over the next two, three, seven days - who knows. But it's a good problem to have."
