Henrik Stenson has withdrawn from The Barclays due to a knee injury.
The Open champion, who claimed a silver medal at the Rio Olympics, fired an opening 74 at Bethpage Black on Thursday before announcing his withdraw from the tournament after suffering discomfort in his right knee.
The Swede was forced to go under the knife in the off-season and decided against further aggravating the injury.
Stenson had begun the week in 14th spot on the FedEx Cup standings. The top 30 advance to the finale at the Tour Championship.
The Northern Irishman needs to win to reclaim the world number one spot from Jon Rahm.
The 56-year-old, who is already the oldest winner on Tour, shot a 64 to claim a share of second place.
Rory McIlroy is excited about the jam-packed schedule that lies ahead.
The American is now sixth in the world rankings.
The world number 89 blamed a new putter as he laboured to a closing round of 77 at the British Masters.
Rahm replaced Rory McIlroy at the top of the rankings following his victory in the Memorial Tournament.
Seven years of hard work paid off in spectacular fashion for Michael Thompson at the 3M Open on Sunday.
Thompson carded birdies at the 16th and the last to secure his second PGA Tour win of his career.
Tom Lewis, the only Briton to make the cut, will start the final round eight shots off the lead.
The 23-year-old won a second European Tour title.