01/03/2013 10:49 GMT | Updated 01/03/2013 11:11 GMT

Rory McIlroy Has Meltdown As He Quits Honda Classic (PICTURES)

Golf is one of the harshest games if you're not on your game. All that walking, tiring the body and the mind as you catch the turf more often than the ball. But Rory McIlroy isn't an amateur, yet he behaved like one when he suffered a meltdown at the Honda Classic.

The world No 1 was the defending champion at PGA National but carded seven over for his round after eight holes on Friday.

rory mcilroy

Rory McIlroy looks disenchanted during his round

Starting at the 10th, the Ulsterman hit his approach at the 18th into the water, took a drop, hit the ball on to the green but decided he had had enough and walked off without putting.

As he headed off, McIlroy said, "There’s not much I can say, guys. I’m just not in a great place mentally."

Twenty-three-year-old McIlroy has struggled to rediscover the form that has elevated his to the top of the world rankings so far in 2013 - after moving to new sponsor Nike - highlighted by his first-round exit at the Accenture Match Play Championship to countryman Shane Lowry last week.

After his first round yesterday, he said: "It's hard to commit to the shot that you need to play every time.

"I felt like I hit the ball okay, not as good as I can, but it's getting there."