DUBAI (AFP) - Rory McIlroy ended his season by winning the US$8 million (S$11.3 million) DP World Tour Championship - his fourth title of the year - on Sunday and retained his Race to Dubai crown to become the European No. 1 for a second straight year.

At the Earth course of Jumeirah Golf Estates, the world No. 3 from Northern Ireland made a Dubai double after a final-round six-under par 66 to beat overnight leader Andy Sullivan of England by one shot. He finished at 21-under 267.

England's Danny Willet (70) was tied fourth in the tournament at 275 while South African Branden Grace (67), who also had a chance to win the Race to Dubai, was third at 273.

The battle for the Rookie of the Year was won by Korea's An Byeong Hun (71), who finished at 275 - the same as his closest rival at the start of the week, England's Matthew Fitzpatrick (70).