Rory McIlroy has been forced to withdraw from the Arnold Palmer Invitational ahead of the third round.
The Masters champion has a back injury, according to the PGA.
The Down man was tied for ninth place after his second round.
He had been warming up with Ryan Fox close to his tee time, but was unable to make it to the first.
It's only McIlroy's second withdrawal during a PGA tournament. In 2013, he didn't complete the second round of the Honda Classic, citing a toothache.
The other was at the 2013 Honda Classic when he was 7 over and claimed he had a tooth ache.
Shane Lowry missed the cut after a mistake on the 18th on Friday.
