In any other sport, it wouldn't be an issue.
LeBron James isn't going to forget how to dunk, and Roger Federer won't suddenly lose his forehand smash. Michael Phelps isn't likely to sink to the bottom of the pool, either.
But this is golf, a game so mental it can sometimes seem impossible. And Rory McIlroy is in trouble.
Not with the PGA Tour, even though he walked off the course in the middle of his round on Friday in the Honda Classic. Officials will surely take at face value McIlroy's belated excuse that he had a toothache, even if he was seen wolfing down a sandwich just minutes before calling it a day.
He seemed to be eating well the night before, too, sending out a picture on Twitter of a birthday dinner for his mother.
But the tooth it is, because it's harder to deal with the other issues that might be facing the No. 1 player in the world. McIlroy himself alluded to them while walking to his car, telling reporters that he's ''not in a good place mentally.''
Just why tha...