Defending champion Brooks Koepka withdrew from the CJ Cup in South Korea before the third round on Saturday citing a knee injury.
"During the course of Friday's round, I slipped on wet concrete aggravating a previous injury to my left knee," said the world number one in a statement.
Koepka last month had stem cells injected into a partially torn tendon in his left patella, a knee injury that had been troubling him for months.
"After consulting with my doctor, I have been advised to withdraw from the CJ Cup and head home for further tests," he said.
"I appreciate everyone's concerns and support. I'll keep you posted as I learn more."
"But other than that, I feel great. My knee feels good. It's the first time it's been feeling consistently good in a while."
- McIlroy rivalry -
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