Rory McIlroy capped the best season of his career by adding the European Tour's money-list title on Sunday to his two major championship victories.

The 25-year-old Northern Irishman, who sat out this week's tournament in Belek, knew the crown would be his provided Sergio Garcia of Spain, German Marcel Siem and Jamie Donaldson of Wales did not win the $7 million Turkish Airlines Open.

"To win the Race to Dubai for the second time really is something truly special," McIlroy said after victory in Turkey went to American Brooks Koepka.

"That four-week spell over the summer, from the Open to the US PGA Championship, would have to be the best golf of my life so I feel like I've really earned the Race to Dubai."

The world No.1 added: "I've put in a lot of hard work this season, with my game and my fitness, so it's nice to get the rewards at the end of it."

McIlroy, who won the tour's flagship event - the BMW PGA Championship at Wentworth and the WGC-Bridgestone Invitational in Ohio - this year, will still go all-out to win next week's DP World Tour Championship in Dubai.

"In some ways the pressure is off but I'll fight very hard to end the year on a high with another victory," he said.

European Tour chief executive George O'Grady saluted McIlroy's 2014 achievements.

"It says something about his outstanding form that Rory ends the year as the dominant player not only on our tour but on the world stage," he said.

Koepka's first European Tour title came after a flawless closing 65 at the Montgomerie Maxx Royal to finish 17 under par, one shot ahead of Ian Poulter.

Siem started the final round one shot off the lead but the BMW Masters winner could only card a closing 71 to finish joint eighth, with Donaldson 19th and Garcia 25th.

Koepka carded four birdies on the front nine and holed from 40ft for another on the 10th, before a brilliant approach to the 13th set up an eagle from just eight feet.

That gave him a two-shot lead. Poulter halved his deficit with his fifth birdie of the day on the same hole, but was unable to find another on the last despite a superb long greenside bunker shot.