The world number 24 copped a golf ball to his back during a pro-am event on Wednesday.

The errant shot, which hit the Australian on the right-hand side of his back, flared up a previous injury concern.

Leishman opted to play in the PGA Tour event at The Greenbrier but withdrew after firing a six-over par 76 in the opening round.

"I can't blame anything I did today on that," the humble Australian told Golf Digest.

"But it did hurt at the time. I was good until yesterday.

"This is frustrating, yeah. I was looking forward to getting the season off to a good start."

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