Tiger Woods has been forced to withdraw from the Northern Trust ahead of his second round with an injury.
The 15-time major champion has a "mild oblique strain that led to pain and stiffness".
In a statement, Woods, 43, said: "I went for treatment early Friday morning but unfortunately I'm still unable to compete.
"I'd like to thanks the New Jersey and New York fans for their support and remain hopeful I can compete next week at the BMW Championship."
The Masters champion had started the first of the FedEx Cup Playoff events at Liberty National with a 75 to sit 13 shots behind leader Troy Merritt after the opening round.
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It is Woods' first withdrawal on the PGA Tour since the 2015 Farmers Insurance Open at Torrey Pines.
If fit, he will likely need a good finish at next week's BMW Championship at Hazeltine National to stand a chance of defending his Tour Championship title.
The top 30 players on the FedEx Cup standings after next week's event advance to the season-finale at East Lake. Starting this week, Woods was ranked 28th.