19 years
Now known as the ATP World Tour, the association has been running since 1972, so that would make it 37 years.
9-10 years
ATP Tour Championship Tennis happened in 1994.
ATP Tour Championship Tennis was created in 1994.
Science Major: Association of Tennis Professionals
It is the Association of Tennis Professionals, responsible for the mens tour and world rankings of male tennis players.
ATP
Novak Djokovic is the top male tennis player on the ATP rankings.
ATP stands for Association Tennis Pro, which is made for men's professional world class tennis players. Hope this helps!
There are way to many regulations to list along with the regulations change according to age group playing in tournaments through the USTA which is the United States Tennis Association and if you go to there website you can see all the regulations along there is a book on all the tennis regulations.
ESPN 3 Tennis on your computer, espn3.com/tennis.
Some of them.