You should really show more of your passion for tennis. Maybe you can talk about that feeling you get when you hit an ace. You could talk about that feeling when you reach up, bend your knees and bring the racquet down on the ball-how exhilarating it is when you serve. Haha, I play tennis too. :)
I came to acknowledge this phrase for the first time while
You should change phrase to something like aphorism.
I felt countless times the urge to quit, especially when on my first game I got hit on my balls
That might be funny when you're talking to your friends, but it seems inappropriate. (the "balls" part)
You also have random words you have capitalized that shouldn't be capitalized like:
Tennis
My Finals
1 % talent
You mentioned 1% talent, but the Einstein quote says 1% inspiration. I'm not sure what you mean there.
to practice Tennis every morning
Practicing tennis every morning shouldn't be embarrassing. That's part of the 99% hard work. Maybe you could expand on that, like: I got up every morning at 5:00 and took the metro to school to practice my serves. I was the only one on the courts. All I could hear was my heavy breathing, the ball bouncing and the birds chirping.
Your idea is really good, just work on clarity and your passion for the sport. :)
Good luck!