Kristian Peter Pless (born February 9, 1981 in Odense, Denmark) is a professional male tennis player from Denmark.

In 1999, he won the Australian Open for juniors (defeated Mikhail Youzhny), and reached the junior finals at Wimbledon (lost to Jürgen Melzer), and the US Open (lost to Jarkko Nieminen). He finished 1999 as the No. 1 ranked junior player in the world.

He turned professional in 1999, and on January 28, 2002, Kristian Pless reached his career-high ATP singles ranking: World No. 65. He has won tournaments at the Futures and Challenger levels, and has reached three semifinals on the ATP Tour. He suffered a serious shoulder injury in 2003, which after multiple surgery kept him out of competition for almost a year.

After returning from injury in 2004, he had dropped in the rankings to World No. 846 on May 24. Subsequently, he has gradually climbed the rankings, and after successful performances at the Challenger level in the fall of 2006, he entered the Top-100 again. In January 2007, he continued his good performances as he defeated World No. 8 David Nalbandian in three sets in the first round of Chennai Open. This was Pless' first win against a Top-10 ranked player.

João Olavo Soares de Souza (born May 27, 1988 in Mogi das Cruzes, Brazil) is a Brazilian professional tennis player. Souza competes mainly on the ATP Challenger Tour, both in singles and doubles. He reached his highest ATP singles ranking, No. 90 August 7, 2011, and his highest ATP doubles ranking, No. 171, on September 21, 2009. Souza is coached by former Brazilian player Ricardo Acioly.

He qualified to the US Open, but was defeated in the first round by wildcard Robbie Ginepri 3–6, 4–6, 7–6, 1–6.

Marcos Diniz Daniel (born on July 4, 1978 in Passo Fundo, Rio Grande do Sul) is a professional tennis player from Brazil who turned professional in 1997. The right-hander reached his highest singles ATP-ranking on September 14, 2009, when he became World No. 56. He is coached by his brother, Márcio.

Marcos Daniel's brother owns an academy for developing young tennis players, called Daniel Tennis Center where Marcos Daniel used to work as a ball catcher. He started playing youth tournaments at age 5. When he was 12, representing this academy, he reached his first final but he did not succeed in winning the title.

In August 2009, he reached the semi-finals of the ATP Gstaad tournament. He also reached the semi-finals there in 2006.

He qualified for the 2009 French Open and lost in the first round to Rafael Nadal after giving a strong performance, 5–7 4–6 3–6.

Fernando Vicente Fibla (born 8 March 1977 in Benicarló) is a tennis player from Spain, who turned professional in 1996. He reached his highest singles ATP-ranking on 12 June 2000, when he became the World Number 29.

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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.