[jester911]

I know what you said. What I am saying is if I make you run your ass off for many balls over time your performance will degrade, therefore I am affecting your performance. That is nothing like golf. Andre Agassi made a living making others run until they could no longer stay with him. There is no question he effected their performance.

All world class clay court players use the same tactic. They were you down until you physically cannot stay with them.