By and large, choosing the most difficult golf courses currently playing host to PGA Tour events is like trying to rank how badly one MMA champion can beat you compared to another. You know they are all tough; it's just a matter of one degree to another when ranking their potential to do harm.
To wit, there's not a single PGA Tour layout that doesn't challenge and often get the better of the best golfers in the world. Likewise, there's not one of those world-class courses that can't be bested by the incredibly-talented professionals.
Variables such as weather, pin placements, tournament pressure and actual course conditions always determine just how tough a course can play, but there are some that always prove a significant challenge no matter the state of the variables, strength of the field or significance of the event.
Here are our most challenging PGA Tour layouts, a small sampling of a distinguished set of golf courses that every year take on the most gifted players in the world.