Ted Williams who knew a little bit about baseball, was a good golfer,
 and a great fisherman said” The toughest thing in sports is to hit a round
baseball with a round bat”.  He meant to hit it on the button and drive it—-OK I can dig that.
 
Your right Ted that’s tough —– if you can do it 1/3rd of your at bats you are headed for the Hall of Fame.
 
Some folks say golf——-too many old hackers at 40 still out there tells me it isn’t. 
 
After watching the highlights of that 6 hour Wimbleton Match I have to think tennis is.
It is draining—stop and start—use every muscle and sinew including the brain—-
6 hours in the blistering sun——that was some game.
 
I have played baseball, and I have played tennis,  And I vote for tennis as toughest.
What the heck did Williams know anyhow ?   
 
 
 my vote is tennis. 

  Your original post asked for the “toughest” sport to play. Did you mean physically or mentally, or the most difficult?

  To me, Australian Rules Football looks to be the hardest on the body. Well, that and rugby. American football seems tame by those standards.

  Tennis is the most difficult of all just because the reaction time is so short. Lot’s to do in 1.5 secs.

  Golf is the most disciplined sport that I know of. The whole body must be in sync at the point of impact or you will not have the desired outcome. It is the only sport that I know of that does not have a ball in motion as you try to hit it, other than croquet.

  JMHO

  David O.