Personally, the best shot I have ever seen is Federer's run-down of a Roddick smash. Check it out here: http://www.metacafe.com/watch/399489/roger_federers_best_shot_ever/
A high tennis shot is called a "lob"** By a "high tennis shot" I assume you mean a shot that YOU hit
Challenges in tennis include: placing a shot were you want it, know what the oppenents shot might be, reacting to a oppenents shot.
Dan Focht
a chop shot is a.k.a. a slice which is a shot with backspin
combariene shot
a shot with no spin.
a smash
Overall, the United States is by far the most successful tennis country in history. Australia, France, and Spain have also had success, but none so consistent as the American team.
A volley in tennis is a shot that is hit before the ball bounces on the ground.
Roger Federer (SUI) 17 Grand Slam Titles
In tennis it's called a ace
absoulotley he is the best player in the history of football.