England's Justin Rose withdrew on the fourth hole Saturday due to back issues during the third round of the Arnold Palmer Invitational in Orlando, Fla.
Rose said he woke up with soreness in his lower back and it never loosened up.
He hit three shots into the water while carding a quintuple-bogey 9 on the par-4 third hole at Bay Hill Club and Lodge. After his fourth shot on the par-5 No. 4, Rose called it a day.
The Englishman entered the day in a tie for seventh place, four shots behind second-round leader Corey Connors of Canada.
"Disappointing to have to WD," Rose told reporters. "... Just kind of woke up with a bit in a sort of spasmed lower back today and tried to kind of get through it. My warm-up was hard work, and I just couldn't stay down in a shot. I missed basically every golf shot left to start the day.
"... I just felt like it was a prudent call, just to call it at that point."
Rose, 40, has 10 career PGA victories, topped by winning the 2013 U.S. Open.
--Field Level Media