Unknown Korean Yong-eun Yang left superstar Tiger Woods trailing to grab the megabucks HSBC Champions Tournament in Shanghai.
Yang, 34, hit a three under par 69 in the final round at Sheshan International Golf Club in China to finish on 14 under par - two clear of world No 1 Woods.
US Open winners Michael Campbell and Retief Goosen shared third place three off the pace with Padraig Harrington six shots behind in a share of sixth.
And Yang, who earns his European Tour card and a place in the world's top 50 for his win, could hardly believe his luck.
After trousering a cheque for €655,883, he said: "This is such a big thing that's happening to me right now, such a big moment in my life right now, that it's really hard for me to explain in words how I feel right now.
"At the start of this week, I noticed that this tournament has a great field and if I were to win it, it would have been worth a lot of World Ranking points. So now that I've won, I expect to play a lot of tournaments.
"I want to play a lot of tournaments overseas, both Europe and the United States and Japan. I just want to be able to compete with the best players in the word, and I think this win has given me that chance."
Overnight leader Goosen looked to have the title within his grasp when he birdied the second and third to pull two strokes clear but the Korean edged ahead with three birdies from the sixth and when Goosen bogeyed both the tenth and 11th holes, the Korean turned the screw with a birdie two on the 12th to move four strokes ahead.
With winning line in sight, Yang had the luxury of two late bogeys as the best players in the world trailed in his wake.
Woods, runner up to David Howell last year, had to settle for second best again but admitted that he bloew his chance with a third round xx.
He groaned: "I had my chances. Yesterday was the day, if I could have hung in there, I could have been a challenge for tournament today but I was too far back and Yang just went on and played some great holes.
"He just went off and it was basically out of reach, and I was just trying to get as many birdies as I can and maybe get second.”
It was a similar tale for Harrington, who erased the memory of a triple bogey eight at the 18th on Saturday with an eagle finish to his final round 70.
The Dubliner's reign at the top of the European Tour Order of Merit lasted exactly two weeks as Yang took over at the top following his win in the first counting event of the 2007 season.
Harrington was eighth overnight following a third round 73 but earned €118,063 for his share of sixth place with Paul Casey and Robert Karlsson, two of his big rivals for the money list title at Valderrama.
Harrington started with 11 pars on the trot before dropping back to back shots at the 12th and 13th.
But he finished with birdies at the 14th and 16th before rounding off with an eagle three at the last worth nearly €60,000.
Scot Marc Warren finished alone in fifth but could have tied Woods for second had his approach to the last not hit the flagstick and ricocheted into a poor lie from where he failed to save par.