Day was injured on the ninth hole at Crooked Stick, when he reached down to put his tee in the ground. He pulled out of the tournament for precautionary reasons and was later diagnosed with a pinched joint capsule in his lower back, according to his manager, Bud Martin.
Day, who headed to the training room for treatment, was not made available for comment.
“Instead of forcing it,” Martin said, “it was more prudent to come in, get it worked on and deal with it.”
By withdrawing, Day will not receive any FedEx Cup points at the BMW. Having entered the week at No. 2 in the standings, he was in danger of sliding to sixth if Paul Casey wins and Jordan Spieth posts a low final round. The top five players in the standings after this week can take the FedEx Cup if they win in two weeks at East Lake.
This isn’t the first time this year that Day has dealt with back issues. He nearly pulled out of the WGC-Match Play in March after suffering an injury, but he played through the pain and won the event.
According to Martin, Day’s trainer, Cornel Driessen, described the situation as similar to last year’s Barclays, when Day tweaked his back picking up an item in his RV. After withdrawing from the pro-am, he went on to win the event.
“Better safe than sorry,” Martin said. “Hopefully he’ll be ready for Atlanta, but the most important thing is the next 15 years, not the next 15 days.”