Four-time major champion Brooks Koepka's PGA Tour season is over after he withdrew from The Northern Trust due to a knee injury.
The former world number one pulled out of the charity exhibition event at TPC Boston on Wednesday as he continues to be troubled by a lingering knee problem.
Koepka is 97th in the FedEx Cup standings and with only the top 70 progressing to the BMW Championship - the second week of the play-offs - the American has played his last tournament of the 2019-20 season.
The 30-year-old missed the cut at the Wyndham Championship last week after failing to win a third consecutive PGA Championship title.
Koepka finished 29th when major golf returned in San Francisco this month.
He missed three months of action last year due to a troublesome right knee and revealed last month he underwent an MRI scan ahead of the Memorial Tournament.
Koepka sid in July: "Just wanted to check on it, see where it's at. We got the results right after Korea, and then we just wanted to check, and nothing is improved.
"It's still the same. So we'll figure it out when we're done."
Koepka has a month to try and get back to full fitness for the U.S. Open at Winged Foot.