National associations must implement the code within its national jurisdiction, report violations up to the ITF and WADA, and report annually about all testing conducted.
The ITF operates the two major annual international team competitions in the sport, the Davis Cup  for men, the Fed Cup  for women.
It also sanctions the Hopman Cup ,  an annual mixed-gender team tournament. The Davis Cup, named after its founder Dwight F. Davis Cup rounds are contested four times per year, scheduled to minimize disruption with the ATP Tour to encourage participation.
In each round, a combination of singles and doubles matches are contested to determine the winners. In , nations participated, making it the largest annual international team competition in sport.
It was launched in to celebrate the 50th anniversary of the ITF. Fed Cup rounds are contested three times per year, scheduled to minimize disruption with the WTA Tour to encourage participation.
The Hopman Cup is an annual team event which is contested by mixed-gender national teams. The first tournament was held in , and the event has been sanctioned by the ITF since Each year, eight nations are selected to compete, with one female and one male invited to attend.
Two pools of four teams each play matches in a round-robin format, with the top team from each pool qualifying for the final.
Tennis lawn tennis was part of the Summer Olympic Games program from the inaugural Summer Olympics , but was dropped after the Summer Olympics due to disputes between the ITF and the International Olympic Committee over allowing amateur players to compete.
It became an official medal-awarding sport in and has been competed at every Summer Paralympics since then. Four events were held from to , with quad events mixed gender in both singles and doubles added in The ITF sanctions the Grand Slam tennis tournaments as well as circuits which span age ranges junior, professional, and seniors as well as disciplines wheelchair tennis ; beach tennis.
In addition to these circuits, the ITF also maintains rankings for juniors, seniors, wheelchair, and beach tennis. The ITF organizes introductory "apprentice" level professional circuits for both men and women as a bridge between junior tournaments and playing on the higher-profile tours organized by the ATP and WTA, respectively.
Professional circuit tournaments are open to all tennis players aged 14 and over based on merit, and offer both prize money and world ranking points for main draw match victories.
The tournaments are owned or sanctioned by the national associations and approved by the ITF. From then until , four-week satellite tournaments were run, where participants were required to compete in the entire series.
In , single-week ITF Futures tournaments were introduced, although they are scheduled in two or three-week geographic clusters. Starting in , the ITF has organized a series of international tennis tournaments for junior players.
In , the ITF introduced combined junior rankings rather than maintaining separate singles and doubles rankings for juniors in an effort to encourage doubles play.
In order to help high-ranking junior girls transition from the junior circuit to the professional circuit, the ITF began the Girls Junior Exempt Project in Under this program, girls ranked in the top 10 at the end of the year are given direct entry into the main draw of three events on the ITF professional circuit the following year.
In , this project was extended for boys under similar rules. Tournaments are classified into various grades, with Grade A being the highest and Grade 5 being the lowest.
Rankings are maintained in a series of age groups where the starting ages advance five years at a time e. In , the world championships were divided into two age ranges, and in it was further divided into three age ranges.
The first circuit for wheelchair tennis , formed in by the National Foundation of Wheelchair Tennis , had ten tournaments.
This includes tournaments ranging from Futures the lowest level up to the Grand Slams. This tour started with 14 tournaments, but has grown to nearly tournaments by The ITF also maintains a system of rankings for beach tennis players.
The ITF designates a World Champion in several disciplines each year based on performances throughout the year, emphasizing the Grand Slam tournaments, and also considering team events such as the Davis Cup and Fed Cup.
Singles champions were first named in , and are chosen by an ITF panel. In later years, World Champion awards were added for doubles, juniors using a combined singles and doubles ranking , and wheelchair players.
For example, Jennifer Capriati was designated as the World Champion in , after winning the Australian Open and French Open and finishing the year ranked number two.
Lindsay Davenport , on the other hand, finished the year ranked number one, but her best performances at majors were two semifinal appearances.
These rankings are used to seed teams at the start of each year in their respective groups. Points are earned by victorious nations depending on the group e.
World Group versus Zonal Groups , the round e. The International Tennis Number ITN  is an international tennis rating system that gives tennis players a number that represents their general level of play.
Conversion charts have been developed linking the ITN to other existing rating systems in ITF tennis nations and in time it is hoped that every tennis player worldwide will have a rating.
Once registered, players can use the IPIN website to enter and withdraw from ITF tournaments, access tournament information and updates, and see details relating to any code of conduct offenses.
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