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Tournaments are often organized by gender and number of players. Common tournament configurations include men's singles, women's singles, and doubles, where two players play on each side of the net. Tournaments may be arranged for specific age groups, with upper age limits for youth and lower age limits for senior players. Example of this include the Orange Bowl and Les Petits As. There are also tournaments for players with disabilities, such as wheelchair tennis and deaf tennis. In the four Grand Slam tournaments, the singles draws are limited to 128 people for each gender.
The Tennis Masters Series is a group of nine tournaments that form the second-highest echelon in men's tennis. Each event is held annually, and a win at one of these events is worth 500 ranking points. When the Association of Tennis Professionals, led by Hamilton Jordan, began running the men's tour in 1990, the directors designated the top nine tournaments, outside of the Grand Slam events, as "Super Nine" events. These eventually became the Tennis Masters Series. In November at the end of the tennis year, the world's top eight players compete in the Tennis Masters Cup, a tournament with a rotating locale. It is currently held in Shanghai, China, and will move to London in 2009
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