Brooks Koepka withdrew from the Arnold Palmer Invitational after 11 holes Sunday because of a rib injury.
Koepka makes his Masters debut in three weeks and is hopeful that a week off with rest and therapy will help. He is No. 18 in the world with wins in Turkey and Phoenix in the past five months.
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He says he first felt discomfort in his back on Friday before posting a 66. He had a trainer stretch during the third round, and it reached a point Sunday where it hurt to breathe and walk. Koepka says the pain after he hit an 8-iron on No. 11 was as bad as he had ever felt on a golf course.
He is scheduled to play the Shell Houston Open after a week off.