Rory McIlroy frustration boils over as Collin Morikawa wins Race to Dubai

A 321-yard drive on the 15th left McIlroy with just 36 yards to the hole, but pitch clatter into the flagstick and rebound into a bunker

FRUSTRATED: Rory McIlroy dejected on the 18th green. 

Rory McIlroy's frustrations boiled over in remarkable fashion after Open champion Collin Morikawa became the first American to win the Race to Dubai in emphatic style with victory in the DP World Tour Championship.

Morikawa carded a closing 66 at Jumeirah Golf Estates to finish 17 under par, three shots clear of defending champion Matt Fitzpatrick and Sweden's Alexander Bjork.