Belfast Live Rory McIlroy withdraws from Arnold Palmer Invitational due to back spasms
The 36-year-old has only withdrawn mid-competition once before in his PGA career, back in 2013 at the Cognizant Classic at the Palm Beaches.
The 36-year-old has only withdrawn mid-competition once before in his PGA career, back in 2013 at the Cognizant Classic at the Palm Beaches.