Defending Zurich Classic of New Orleans champions Rory McIlroy and Shane Lowry explained how they go about picking which golf ball to use in foursomes

The Irish duo of Rory McIlroy and Shane Lowry failed to defend their title at the Zurich Classic of New Orleans after a tough back nine on Sunday.

It's never a good thing to have too many swing thoughts in your head over the ball. It's even worse when they're of the negative variety. This is true even among the best players in the world, something we saw play out on Wednesday at the Zurich Classic.