Keegan Bradley held off Justin Rose in a sudden-death playoff to win the rain-plagued BMW Championship on Monday for his first PGA Tour victory in six years.
Casey cited back pain for pulling out of the FedEx Cup playoff event at Aronimink on Monday morning.
The three-time major champion arrived at Aronimink needing to finish no lower than 28th to cement his place in the 30-man field in Atlanta, which he will now miss for the first time since first earning his card in 2013. Going down the last nine, the lead kept changing hands and it was Rose who was on a charge having made birdies on the 16th and 17th holes.
Returning for a rare Monday finish due to the weather - for the second week in a row after the traditional Labor Day conclusion to the Deutsche Bank Championship - McIlroy started one shot off Justin Rose. This is significant because it's the first time Spieth has missed the Tour Championship as a professional, but it's also significant because Spieth will end the season with only 24 tournaments played.
"A lot has happened to me over these six years", Bradley said. The others are Tiger Woods, Ernie Els, Adam Scott, Jason Day, Rory McIlroy, Singh, Kaymer and Johnson. "If I had made a few more putts this week could have been a different deal coming down the stretch".
"To have a chance to win again, this year, it's a very positive feeling", Woods said. He had his fourth back surgery last April, and at this time past year he had just been cleared to chip and putt.
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"I talked to the Tour a little while back and I didn't really think much of it and it becomes a situation then".
Spieth failed to qualify for the season-ending Tour Championship next week after finishing tied for 55th at the BMW Championship and slipping from 27th to 31st in the FedExCup standings.
Spieth began the year ranked second in the world but has dropped to 10th after failing to win and posting just five top-10 finishes.
Jordan Spieth is likely to be fined $20,000 for failing to play the minimum 25 tour events after failing to reach the Tour Championship.
"It's something I can say now in my career I've been the best player in the world".
Bradley and Xander Schauffele, who finished one shot out of the playoff, moved into the top 30 to qualify for East Lake, and Emiliano Grillo joined Spieth as the two players who fell out.