Jon Rahm clinched his second DP World Tour Championship title in the last three years years to clinch his first European Tour Race to Dubai title.
Rahm, 25, prevailed by one stroke over Tommy Fleetwood and Mike Lorenzo-Vera after making a stunning up-and-down for birdie from the greenside bunker on the par-5 18th.
Rahm, who arrived at the eighth Rolex Series event of the season as one of five players who could be crowned Europe's No.1, carded a final-round 4-under 68 to finish on 19-under par.
The victory marks Rahm's sixth career European Tour title and his third this season following wins at the Irish Open and Open de Espana.
Rahm had led by six shots after seven holes but Fleetwood birdied three of his last four in a 65 to set the target at 18-under par and as Rahm stood on the 18th tee, the whole season was heading to a playoff.
The big-hitting Spaniard hit a perfect drive up the last but found the sand with his second before putting a sublime bunker shot to four feet and rolling home for a birdie and his first career Harry Vardon Trophy.
Lorenzo-Vera, playing alongside Rahm in the final group, carded a final-round 70 to finish in solo third on 17-under par.
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Rory McIlroy started the final day two strokes off the pace but he could not get anything going and struggled to a final-round 73 to finish solo fourth on 12-under par.
Danny Willett was back in fifth on 11-under par.
Rahm takes home not just the $3 million world record first prize but a $2 million bonus for topping the Race to Dubai Rankings Presented by Rolex, with Fleetwood, Bernd Wiesberger - who led the Rankings coming into the week - Shane Lowry and Mathew Fitzpatrick also taking home bonuses for finishing in the top five.