Tiger Woods has withdrawn from The Northern Trust ahead of his second round at Liberty National.
Woods struggled to an opening 75 on Thursday after restricting himself to chipping and putting on the back nine of Wednesday's pro-am due to stiffness in his back.
In a statement, the Masters champion wrote: "Due to a mild oblique strain that led to pain and stiffness, I have to withdraw from The Northern Trust.
"I went for treatment early Friday morning, but unfortunately I'm still unable to compete. I'd like to thank the New Jersey and New York for their support and remain hopeful I can compete next week at the BMW Championship."
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