World number one Novak Djokovic was sensationally disqualified in the US Open fourth round on Sunday after striking a line judge with a ball following a point during the first set of his match against Spain's Pablo Carreno Busta.
Following is a list of players who have been defaulted from a tour-level match for on-field misconduct:
2020 - Novak Djokovic (Serbia), US Open
Top seed Djokovic was defaulted from his fourth round match against Spain's Pablo Carreno Busta after striking a line judge with a ball following a point.
2019 - Nick Kyrgios (Australia), Italian Open
Kyrgios was disqualified from his second round match against Norway's Casper Ruud at the Foro Italico after the volatile Australian hurled a chair on to the court.
2017 - Denis Shapovalov (Canada), Davis Cup
Shapovalov was defaulted from a Davis Cup tie against Britain's Kyle Edmund after the Canadian inadvertently struck a ball into the umpire's face.
2012 David Nalbandian (Argentina), Queens's Club Championships
Nalbandian was disqualified from the Queens's Club Championships final in London after injuring a line judge by kicking an advertising board into his shin.
2009 - Serena Williams (US), US Open
Williams was defaulted on the final point of her US Open semi-final against Belgian Kim Clijsters following an argument with a line judge, who reported the American for verbal abuse.
2007 - Stefan Koubek (Austria), Open de Moselle
Koubek was disqualified from his opening round match against Sebastien Grosjean in Metz after using abusive language to the tournament supervisor while disputing a call.
2007 - Anastasia Rodionova (Australia), Cincinnati Open
Rodionova was defaulted from her opening round match against German Angelique Kerber after the Russian-born Australian hit the ball at fans cheering for her opponent.
1996 - Irina Spirlea (Romania), Palermo Ladies Open
Spirlea became the first WTA player to be disqualified after directing abusive language at an official during her second round match against Stephanie De Ville in Palermo.
1995 - Carsten Arriens (Germany), French Open
German qualifier Arriens was disqualified from the Paris Grand Slam during his opening round match against Brett Steven of New Zealand after hitting a line judge with his racket.
1995 - Jeff Tarango (US), Wimbledon
Tarango walked out on his third round match against German Alexander Mronz after a row with the umpire.
1995 - Tim Henman and Jeremy Bates (Britain), Wimbledon
The British doubles pair of Jeremy Bates and Tim Henman became the first players to be disqualified from Wimbledon in the professional era after Henman accidentally fired a ball into the head of a ball girl following a point.
1990 - John McEnroe (US), Australian Open
The American was disqualified from his fourth round match against Mikael Pernfors after being handed three code violations.