Andre Kirk Agassi ( ; born April 29, 1970) is an American retired professional tennis player and former World No. 1 who was one of the sport's most dominant players from the early 1990s to the mid-2000s.
 Generally considered by critics and fellow players to be one of the greatest tennis players of all time, Agassi has been called the greatest 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 compiled performances that, along with his unorthodox apparel and attitude, saw him cited as one of the most charismatic players in history.
 As a result, he is credited for helping to revive the popularity of tennis during the 1990s.
John Robert Isner (born April 26, 1985) is an American professional tennis player who is currently ranked world No. 17 in men's singles by the Association of Tennis Professionals (ATP).
 Considered one of the best servers of the ATP World Tour, Isner achieved his career-high singles ranking of world No. 9 in April 2012.
 In 2013, he became the 18th player to serve more than 5,000 aces on the ATP World Tour.
 He currently has 4th-most aces in the history of ATP, having served more than 8,800 aces.
 At the 2010 Wimbledon Championships, he played the longest professional tennis match in history, defeating Nicolas Mahut in a total of 11 hours and 5 minutes of play over the course of three days.
 He also played the then 10th-longest singles match, a 5-hour 41-minute encounter in the second round of the 2012 French Open.
Annie Miller (born January 19, 1977) is a retired American professional tennis player.
 Miller attained a career high singles ranking of 40 on 21 September 1998.
 She is best known for being the first opponent of Serena Williams in Williams' professional career, Miller winning the match 6-1, 6-1.
Ron Blum is a former American football official in the National Football League (NFL), having served in that role from the 1985 NFL season through the 2007 NFL season.
 He joined the league as a line judge, officiating Super Bowl XXIV in 1990 and Super Bowl XXVI in 1992 and later became a referee for the start of the 1993 NFL season, replacing retired legend Pat Haggerty.
 Blum moved back to line judge beginning with the 2004 NFL season, and worked his last three seasons on the crew of referee Tony Corrente.
Andre Agassi was the defending champion, but was defaulted in his second round match against Cecil Mamiit for swearing at a line judge.
Albert Burke (1901 – 1958) was an Irish professional tennis player based in France.
 Albert Burke was the son of Thomas Burke.
 Thomas Burke was a professional tennis player when professional tennis began in the late 19th century and Albert Burke's brother Edmund Burke was also a professional tennis player .
 Albert Burke won the Bristol Cup in France (the top professional tournament in the world in the 1920s), in 1924 and 1925 (beating Roman Najuch in both finals) .
 He was also losing finalist in the Bristol Cup in 1926, 1929 and 1931 (losing all three finals to Karel Kozeluh) .
 Burke finished second in the 1930 French Pro Championship round robin (Karel Kozeluh was first) .
 At the US Pro Tennis Championships Burke was a quarter finalist in 1931 (losing to Howard Kinsey) and 1932 (losing to Bill Tilden) .
 At the Wembley Championships Burke lost in the quarter finals in 1935 (losing to Ellsworth Vines) .
Jacqueline Trail Harang (born Jacqueline Amanda Trail, November 26, 1980, in Paducah, Kentucky) is a retired American professional tennis player.
 Trail had a prolific junior tennis career and played on the professional tour from 1997 to 2003.
 She retired due to injury in 2003.
Jeffrey Gail ("Jeff") Tarango (born November 20, 1968) is a retired American professional tennis player.
 He was a Top 10 doubles player and a runner-up at the 1999 French Open Men's Doubles tournament.
 At Wimbledon in 1995, he defaulted a match after a dispute with the umpire, and his wife assaulted the umpire once Tarango had left the court.
James Cluskey (born 18 August 1986) is a retired Irish professional tennis player, mainly playing doubles.
 He was born in Dublin, Ireland and attended Belvedere College along with fellow Irish tennis player James McGee.
 Cluskey is currently the highest ranked Irish doubles player.
 Cluskey retired from professional tennis in November 2015.
Guillermo Vilas (] ; born 17 August 1952) is a retired professional tennis player from Argentina, N°1 of the Grand Prix tennis circuit's Season in 1974, 1975 and 1977, who won four majors, seven Grand Prix Super Series titles and 62 ATP titles.
 He was inducted into the International Tennis Hall of Fame in 1991.
 Known for his prolific match play, especially on clay, he became the second man to win more than 900 matches in the Open Era, and his number of match wins on clay are by far the most of the Era.
 His peak was the 1977 season during which he won two major titles (both on clay), had two long match win streaks of 46 all-surface and 53 on clay, and finished with an Open Era record of match wins.
 In 2005, Tennis magazine ranked him as the 15th-best male player of the preceding 40 years.
 He also popularized the between-the-legs tweener shot, also known as the "Gran Willy" in his honor.

Question: Which retired American professional tennis player was defualted in a 1999 match for swearing at a line judge?
Answer: Andre Agassi