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

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.

Rory McIlroy, playing for the first time since winning the Masters, teamed with Shane Lowry to shoot an 8-under 64 in better-play Thursday in the Zurich Classic, leaving the Irish defending champions