World number five Tiger Woods has confirmed he has withdrawn from The Northern Trust after the first round.
The American recorded a four-over 75 in the opening round on Thursday and he was set to start his second round 13 shots off the pace.
Woods has been struggling with stiffness in his back all week and he has now confirmed he has a mild oblique strain.
Treatment on Friday failed to improve the issue and Woods has now revealed his decision to miss the first event of the FedExCup Play-Offs.
In a statement, Woods said: “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.”
Woods has now played just 13 tournament rounds since he won the Masters in April and his chances of playing at the BMW Championship next week are now under threat.