A balky back will keep Rickie Fowler from defending his first professional title next week in Korea.
Fowler, 23, withdrew from a pair of tournaments in Asia on Friday, citing a back injury, according to Reuters. The Korean Open, which Fowler won in 2011 over Rory McIlroy, is among the events he'll miss.
"Unfortunately, while not serious, I have battled a back issue for the past few months, and my doctors have instructed me that international travel and any tournament play is not in my best interest at this time," Fowler said in a statement on Friday.
"They have instructed me rather to focus on a therapy regimen in order to find relief as well as prevent potential issues in the future.
Fowler will also miss the $6.1 million CIMB Classic in Kuala Lumpur, Malaysia, a PGA Tour event scheduled for the end of October.