Answer:
Blade to blade I always win My foe laid low and even. Yard by yard through thick and thin I'm busiest in season.
I touch the Earth, I touch the sky, but if I touch you, you’ll likely die. What am I?
You can read me both ways I wear; One way it's a number reversed a snare.
Take off my skin I won't cry but you will.
A sport with love and service played by singles and pairs.
What do people want the least on their hands?