Tennis is a racket sport that is played either individually against a single opponent (singles) or between two teams of two players each (doubles). Each player uses a tennis racket strung with a cord to strike a hollow rubber ball covered with felt over or around a net and into the opponent's court. The object is to manoeuvre the ball in such a way that the opponent is not able to play a valid return. If a player is unable to return the ball successfully, the opponent scores a point.
The Davis Cup is the premier international team event in men's tennis. It is organised by the International Tennis Federation (ITF) and contested annually between teams from over 150 competing countries, making it the world's largest annual team sporting competition. It is described by the organisers as the "World Cup of Tennis" and the winners are referred to as the world champions. The competition began in 1900 as a challenge between Great Britain and the United States. By 2023 155 nations entered teams into the competition.
Wheelchair tennis is one of the forms of tennis adapted for wheelchair users. The size of the court, net height and rackets are the same, but there are two major differences from pedestrian tennis: athletes use specially designed wheelchairs, and the ball may bounce up to two times, where the second bounce may also occur outside the court.
The International Tennis Federation (ITF) is the governing body of world tennis, wheelchair tennis, and beach tennis. It was founded in 1913 as the International Lawn Tennis Federation by twelve national tennis associations. As of 2016, there are 211 national and six regional associations that make up the ITF's membership.
The Billie Jean King Cup is the premier international team competition in women's tennis, launched as the Federation Cup in 1963 to celebrate the 50th anniversary of the International Tennis Federation (ITF). The name was changed to the Fed Cup in 1995, and changed again in September 2020 in honor of former World No. 1 Billie Jean King. The Billie Jean King Cup is the world's largest annual women's international team sports competition in terms of the number of nations that compete. The current chair is Katrina Adams.
The Grand Slam Cup was a tennis tournament held annually at the Olympiahalle in Munich, Germany from 1990 through 1999. The event was organized by the International Tennis Federation (ITF), which invited the best-performing players in the year's Grand Slam events to compete in the Grand Slam Cup.
The ATP Tour is the sole worldwide top-tier tennis tour for men organized by the Association of Tennis Professionals founded in 1990 that replaced the earlier dual Grand Prix Circuit and WCT Circuit. The second-tier tour is the ATP Challenger Tour and the third-tier is the ITF Men's World Tennis Tour. The equivalent women's organisation is the WTA Tour.
Yves Allegro is a retired Swiss professional tennis player. He is a doubles specialist and is well known as compatriot Roger Federer's doubles partner and friend. Allegro and Federer teamed up in doubles at the Australian Open in 2003 and 2004.
The ATP Challenger Tour, known until the end of 2008 as the ATP Challenger Series, is a series of international men's professional tennis tournaments. It was founded in 1976 when it replaced the ILTF Satellite Circuit as the second tier of tennis. The Challenger Tour events are the second-highest tier of tennis competition, behind the ATP Tour. The ITF World Tennis Tour tournaments are on the entry-level of international professional tennis competition. The ATP Challenger Tour is administered by the Association of Tennis Professionals. Players who succeed on the ATP Challenger Tour earn sufficient ranking points to become eligible for main draw or qualifying draw entry at ATP Tour tournaments. Players on the Challenger Tour are usually young players looking to advance their careers, those who fail to qualify for ATP events, or former ATP players looking to get back into the big tour.
The International Tennis Federation (ITF) designates a World Champion each year based on its own majority opinion of performances throughout the year, emphasizing the Grand Slam tournaments, and also considering team events such as the Davis Cup and Fed Cup. Men's and women's singles champions were first named in 1978; the title is now also awarded for doubles, wheelchair, and junior players. It is sometimes named the "ITF Player of the Year" award, alluding to similar other year-end awards in tennis.
Esther Mary Vergeer is a Dutch former professional wheelchair tennis player. Vergeer won 43 major titles, 23 year-end championships, and seven Paralympic gold medals. She was the world No. 1 in women's wheelchair singles from 1999 to her retirement in February 2013. Vergeer went undefeated in singles for ten straight years, ending her career on a winning streak of 470 matches. She has often been named the most dominant player in professional sports.
The International Tennis Federation (ITF) designates a World Champion each year based on its own majority opinion of performances throughout the year, emphasizing the Grand Slam tournaments, and also considering team events such as the Davis Cup and Fed Cup. Men's and women's singles champions were first named in 1978; the title is now also awarded for doubles, wheelchair, and junior players. It is sometimes named the "ITF Player of the Year" award, alluding to similar other year-end awards in tennis.
The Association of Tennis Professionals (ATP) Tour is the elite professional tennis circuit organised by the ATP. The 1999 ATP Tour calendar comprises the Grand Slam tournaments, supervised by the International Tennis Federation (ITF), the ATP Super 9, the ATP Championship Series, the ATP World Series, the ATP World Team Cup, the ATP Tour World Championships and the Grand Slam Cup. Also included in the 1999 calendar are the Davis Cup and the Hopman Cup, which do not distribute ranking points, and are both organised by the ITF.
Cristian Brandi is a former professional tennis player from Italy.
The ITF rankings are the current rankings of national teams by the International Tennis Federation in both men's and women's tennis. The ITF produces two sets of rankings—the ITF Davis Cup Nations Ranking for male national teams, and the ITF Fed Cup Nations Ranking for female national teams. Both sets of rankings measure the success of all nations participating in both competitions.
Sílvia Soler Espinosa is a retired Spanish tennis player.
Dimitar Kuzmanov is a Bulgarian professional tennis player. He competes on the ATP Challenger Tour. His highest singles ranking is No. 159 achieved on 29 August 2022, whilst his best doubles ranking is No. 438 achieved on 1 April 2019.
Nina Stojanović is a Serbian professional tennis player. On 2 March 2020, Stojanović reached a career-high singles ranking of world No. 81. On 17 January 2022, she peaked at No. 37 in the WTA doubles rankings.
Chantal Vandierendonck is a Dutch former professional wheelchair tennis player. Vandierendonck won various wheelchair tennis championships held by the International Tennis Federation and multiple Paralympic medals from 1988 to 1996. She was inducted into the International Tennis Hall of Fame in 2014.
Denisa Krajčovičová is a former professional tennis player from Slovakia. From 1991 to 1996, she was known under her married name Denisa Szabová.
2024 Internazionali di Tennis del Friuli Venezia Giulia 
