Tommy Haas (born 3 April 1978 as Thomas Mario Haas) is a German and recently naturalized American professional tennis player. He has competed on the ATP Tour since 1996. After breaking into the World Top 100 in 1997, and reaching a career-high singles ranking of World No. 2 on 13 May 2002, Haas's career has been interrupted by injuries: whilst a professional, he has twice dropped out of the world rankings due to being inactive for twelve months. His first period of injury saw him miss the whole of the 2003 season, and he did not return to the world's top ten until 2007. He also missed over a year's tennis between February 2010 and June 2011, but has since returned to play on the Tour.

Haas has never won a Grand Slam tournament, his best result being three-time semi-finalist at the Australian Open and one semi-final at Wimbledon. He has won thirteen career titles in singles and doubles, including one Masters tournament, and has a silver medal from the 2000 Summer Olympics.

His equipment include Solfire, Lacoste and Nike for his clothes and shoes, respectively. He switched to using Head racquets in 2009 after using Dunlop Sport racquets for most of his career.

Fabio 'The Fog' Fognini (born 24 May 1987 in Sanremo, Italy) is a professional tennis player and the current Italian No. 2. His career-high singles ranking is World No. 32, which he reached on June 20, 2011 after reaching the quarter-finals of the 2011 French Open. His favourite surface is the red clay of Paris, where he also reached the quarter-finals as a junior in 2004.

Fognini was born to Silvana and Fulvio, a businessman, and has a younger sister called Fulvia. He began playing tennis when he was four years old and is also a fan of football and motorbike racing. Fognini speaks Italian, English, Spanish and French.

Fognini began his professional career by playing a variety of Futures and Challenger tournaments, winning his first Futures title in 2005 at Spain #1 and another at Italy #9. In 2005, he also finished runner-up at Italy #3 and qualified for his first ATP Challenger tournament at Palermo. During 2006, Fognini had moderate success at Challengers and, after qualifying, made his debut on the ATP World Tour at Buenos Aires. He was defeated in the first round by Carlos Moyá, the eventual champion.

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).

Horacio Zeballos Jr. (born on April 27, 1985 in Mar del Plata) is a professional Argentine tennis player on the men's circuit. His highest singles ranking to date is World Number 41, which he reached on November 16, 2009. His highest doubles ranking to date has been World Number 32, on October 25, 2010. He has played most of his tennis on the Challenger events. He qualified for the US Open and defeated Michael Berrer in the first round for his first win at Grand Slam level, before losing to Tomáš Berdych in 4 sets in the second round.

Zeballos enjoys music, ping-pong, and swimming. His father is named Horacio Zeballos as well, and his mother is named Carolina. He has one sister, Carolina Jr. His favorite surface is the clay and was coached by Alejandro Lombardo until March 22, 2012.

He reached the final in the St. Petersburg Open in Russia, losing to Ukrainian Sergiy Stakhovsky. He also reached the doubles final at the Movistar Open in Santiago in 2010, partnered with Potito Starace. They lost to the number 1 seeds, Łukasz Kubot and Oliver Marach. He then won the title in doubles at the Copa Telmex with Sebastián Prieto. Zeballos won the 2009 ATP Newcomer of the Year award on February 17, 2010.

Philipp Kohlschreiber (born 16 October 1983 in Augsburg) is a tennis player from Germany, who turned professional in 2001. The right-hander has won six doubles and four singles titles. Kohlschreiber reached his highest ATP singles ranking of World No. 22 on 28 September 2009.

In 2007, Kohlschreiber achieved his greatest result at an ATP Masters Series event during the Monte Carlo Masters, when he reached the quarter-finals after going through qualifying, defeating World No. 12 David Nalbandian in the second round. He won his first career title in Munich defeating Mikhail Youzhny, thereby becoming the first German player to win the event since Michael Stich in 1994.

Kohlschreiber started 2008 by reaching the quarter-finals of the tournament in Doha, Qatar and winning his second career title in Auckland, New Zealand, where he defeated Juan Carlos Ferrero in the final.

After Kohlschreiber's win in Auckland, he defeated World No. 6 Andy Roddick in the third round of the Australian Open 6–4, 3–6, 7–6, 6–7, 8–6. Kohlschreiber hit a personal record 32 aces and 104 winners. He eventually lost in the fourth round to Jarkko Nieminen 6–3, 6–7, 6–7, 3–6. Kohlschreiber failed to convert 11 set points in the second (7) and third (4) sets.