Johnny Miller: 'Rory McIlroy's in love for the first time'

NBC analyst Johnny Miller believes that Rory McIlroy may be 'distracted' by his relationship with tennis star Caroline Wozniacki.

The couple have been dating since 2011, but the Northern Irishman's form has dipped this season despite retaining the world number two spot.

"I think he's in love for the first time," Miller told the San Francisco Chronicle. "It's a wonderful feeling, and it's distracting."

McIlroy is currently preparing for the Open at Muirfield this week.