Gustavo Kuerten (Portuguese pronunciation: [ɡusˈtavu ˈkiɾtẽ]; born September 10, 1976) is a retired former World No. 1 tennis player from Brazil. He won the French Open three times between 1997 and 2001, and was the Tennis Masters Cup champion in 2000.

Kuerten suffered many problems with injuries which led him to miss a number of tournaments between 2002 and 2005. After a few failed attempts of comebacks, he retired from top-level tennis in May 2008.

Kuerten is also known as "Guga" (pronounced: [ˈɡuɡɐ]), an affectionate nickname which is a common abbreviation of the name "Gustavo" in Portuguese-speaking countries. He is a polyglot who speaks fluent Portuguese, Spanish, English and French.^{[citation needed]}

Kuerten was born in Florianópolis in southern Brazil. He comes from an ethnically German family. He began playing tennis when he was six, an early start to a life and career marked by family tragedy. His father, a former amateur tennis player, died of a heart attack in 1985 while umpiring a junior tennis match in Curitiba, when Kuerten was only eight years old. His older brother, Raphael, is currently his business manager. His youngest brother suffered prolonged oxygen deprivation and consequently irreparable brain damage during birth, and as a result suffered from mental retardation and severe physical disability until his death in 2007. Kuerten was deeply affected by his brother's daily struggles, later donating the entire prize money from one tournament he has won every year of his professional career so far to a hometown NGO that provides assistance for people suffering from similar disabilities. He gave every trophy he won to his younger brother as a souvenir, including the three miniature replicas of the French Open men's singles trophy. His favourite football team is brazilian Avaí Futebol Clube.

Peter "Pete" Sampras (/ˈsæmprəs/; born August 12, 1971) is a retired Greek–American tennis player and former world number 1. During his 15-year tour career, he won 14 Grand Slam singles titles and became recognized as one of the greatest tennis players of all time.

Sampras debuted on the professional tour in 1988 and played his last top-level tournament in 2002 when he won the US Open, defeating rival Andre Agassi in the final. He was the year-end world no. 1 for six consecutive years (1993–1998), a record for the open era. His seven Wimbledon singles championships are also an Open Era record. He spent 286 weeks at no. 1, the most of any male player. His five US Open singles titles is an Open Era record shared with former world no. 1 players Jimmy Connors and Roger Federer. Sampras is the last American male to win Wimbledon (2000) and the ATP World Tour Finals (1999).

Novak Djokovic (Serbian: Новак Ђоковић or Novak Đoković; pronounced [nɔ̂ʋaːk dʑɔ̂ːkɔʋitɕ] ( listen); born 22 May 1987) is a Serbian professional tennis player who has been ranked World No. 1 by the Association of Tennis Professionals (ATP) since 4 July 2011. He has won five Grand Slam singles titles: the 2008, 2011 and 2012 Australian Open, the 2011 Wimbledon Championships, and the 2011 US Open. By winning three Majors in 2011, Djokovic became the sixth male player in the open era to win three Majors in a calendar year.

He is the first male player representing Serbia to win a Major singles title and the youngest player in the open era to have reached the semifinals of all four Grand Slam events, separately and consecutively. Amongst other titles, he won the Tennis Masters Cup in 2008 and was on the team which won the 2010 Davis Cup. He also won the bronze medal in singles at the Beijing Olympics in 2008. He has won 11 Masters 1000 series titles placing him joint fourth on the all time list. Djokovic has quickly moved up in the rankings of history. Tennis Channel ranked him number 40 , and former player Pat Cash said he is one of the greatest ever.

Andre Kirk Agassi ( /ˈɑːndreɪ ˈæɡəsi/; born April 29, 1970) is a retired American professional tennis player and former world no. 1. Generally considered by critics and fellow players to be one of the greatest tennis players of all time, Agassi has been called the best service returner in the history of the game. Described by the BBC upon his retirement as "perhaps the biggest worldwide star in the sport's history", Agassi's performances, along with his unorthodox apparel and attitude, have seen him cited as one of the most charismatic players in the history of the game, and credited for helping revive the popularity of tennis during the 1990s.

In singles tennis, Agassi is an eight-time Grand Slam champion who competed in 15 Grand Slam finals, and an Olympic gold medalist. A multi-surface specialist, he is the first of two male players to have achieved a singles Career Golden Slam, and one of four to have achieved a singles Career Grand Slam in the Open Era (one of seven in history). He was the first male player to win all four Grand Slams on three different surfaces (hard, clay and grass), and is the last American male to win the French Open (1999) and the Australian Open (2003). Agassi also won 17 ATP Masters Series titles, the 1990 ATP Tour World Championships, and was part of a winning Davis Cup team in 1990 and 1992. He is the only male singles player in history to have won all four Grand Slam tournaments, the Olympic gold medal and the ATP Tour World Championships: a distinction dubbed as a "Career Super Slam" by Sports Illustrated.

Roger Federer (German pronunciation: [ˈfeːdəʁɐ]) (born 8 August 1981) is a Swiss professional tennis player who held the ATP No. 1 position for a record 237 consecutive weeks from 2 February 2004 to 18 August 2008. Federer has occupied the #1 ranking for 285 overall weeks, one week short of the record 286 weeks held by Pete Sampras. As of 28 May 2012, he is ranked World No. 3. Federer has won a men's record 16 Grand Slam singles titles. He is one of seven male players to capture the career Grand Slam and one of three (with Andre Agassi and Rafael Nadal) to do so on three different surfaces (clay, grass, and hard courts). He is the only male player in tennis history to have reached the title match of each Grand Slam tournament at least five times and also the final at each of the nine ATP Masters 1000 Tournaments. Many sports analysts, tennis critics, and former and current players consider Federer to be the greatest tennis player of all time.

Federer has appeared in an unprecedented 23 career Grand Slam tournament finals, including a men's record ten in a row, and appeared in 18 of 19 finals from the 2005 Wimbledon Championships through the 2010 Australian Open, the lone exception being the 2008 Australian Open. He holds the record of reaching the semifinals or better of 23 consecutive Grand Slam tournaments over five and a half years, from the 2004 Wimbledon Championships through the 2010 Australian Open. At the 2012 Australian Open, he reached a record 31st consecutive Grand Slam quarterfinal. During the course of his run at the 2012 French Open in Roland Garros, Federer eclipsed Jimmy Connors long standing record of 233 match wins in Grand Slam tournaments when he defeated Adrian Ungur in a second round match.