Entering the 2014 PGA Championship, even the guy pictured above has concerns.
If you were the inappropriate-joke type, you might say, "Rory McIlroy has fewer concerns now that he's single," but that's neither here nor there (nor is it likely true).
His real worries have to do with probability, as you'll see.
The rest of golf's brightest stars have a lot on their minds as they prepare for the first round of the 2014 PGA Championship at Valhalla. Some, assuredly, are much more carefree than others.
Who is worried about what?
Click through to see.