I once had a shot hit off my shin and go over for a winner. No one noticed, I didn't tell them until after the match was over--it was rec. I made them buy me a beer. It's much harder to hit a tennis ball with your shin then a racket. I keep my leg hairs strung at 60 lbs.
"...the human emotional system was not designed to endure the mental rigors of a tennis match." Dr. Allen Fox