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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 stands for Association Tennis Pro, which is made for men's professional world class tennis players. Hope this helps!
A Grand Slam is a tournament of the ranked players and it spans across different continents. There are 4 Grand Slams in a year. The ATP is the Association of Tennis Professionals.
The Association of Tennis Professionals (ATP) was founded in September 1972 by Donald Dell, Jack Kramer and Cliff Drysdale. Its aim is to protect the interests of male tennis players. The women's counterpart organisation is the Women's Tennis Association.
Steroids are banned substances on the ATP and WTA tours. Players are subject to random testing.
The Association of Tennis Professionals (ATP) started in 1972 by male tennis players who were dissatisfied with the way the tour had been run up to that point, including the lack of prize money to any but the top few players. The Women's Tennis Association (WTA) started almost the same way in 1973. Refer to the ATP and WTA links, below, for further information.
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As per the recent ranking (October, 2011) by ATP, Novak Djokovic of Serbia is No. 1 in Men's Tennis and Caroline Wozniaki of Denmark is No. 1 in Women's Tennis.
ATP Tour Championship Tennis happened in 1994.
ATP Tour Championship Tennis was created in 1994.