Question: Information: - The 2012 Summer Olympics, formally the Games of the XXX Olympiad and commonly known as London 2012, was a major international multi-sport event celebrated in the tradition of the Olympic Games, as governed by the International Olympic Committee (IOC). It took place in London and to a lesser extent across the United Kingdom from 25 July to 12 August 2012. The first event, the group stage in women's football began on 25 July at the Millennium Stadium in Cardiff, followed by the opening ceremonies on 27 July. 10,768 athletes from 204 National Olympic Committees (NOCs) participated. - Christopher Kas (born 13 June 1980) is a professional German tennis player. His career-high ATP singles ranking is World No. 224, which he reached in November 2002. His career-high in doubles is World No. 17, achieved in February 2012. At the 2012 Summer Olympics, he finished in fourth place in mixed doubles alongside Sabine Lisicki. In January 2015, Sabine appointed him to her coaching team. - Tennis is a racket sport that can be played individually against a single opponent (singles) or between two teams of two players each (doubles). Each player uses a tennis racket that is strung with cord to strike a hollow rubber ball covered with felt over or around a net and into the opponent's court. The object of the game is to play the ball in such a way that the opponent is not able to play a valid return. The player who is unable to return the ball will not gain a point, while the opposite player will. - The Davis Cup is the premier international team event in men's tennis. It is run by the International Tennis Federation (ITF) and is contested annually between teams from competing countries in a knock-out format. It is described by the organisers as the "World Cup of Tennis", and the winners are referred to as the World Champion team. The competition began in 1900 as a challenge between Great Britain and the United States. By 2016, 135 nations entered teams into the competition. The most successful countries over the history of the tournament are the United States (winning 32 tournaments and finishing as runners-up 29 times) and Australia (winning 28 times, including four occasions with New Zealand as Australasia, and finishing as runners-up 19 times). The present champions are Argentina who beat Croatia to win the title for the first time in 2016. - Viktor Troicki ( pronounced / trtski / , TROY - tskee , Serbian : ( iktor trotski ) , Serbian Cyrillic : ; born 10 February 1986 ) is a Serbian professional tennis player . He won his first ATP singles title at the 2010 Kremlin Cup , beating Jo - Wilfried Tsonga in the second round and Marcos Baghdatis in the final . He won his second ATP singles title at the 2015 Apia International Sydney beating Mikhail Kukushkin in the final . In 2016 Troicki successfully defended his title , defeating Grigor Dimitrov in the final . He also won an ATP doubles title with Christopher Kas at the 2010 PTT Thailand Open . However , his biggest achievement was winning the deciding rubber in Serbia 's Davis Cup final against France in 2010 , which eventually lifted Troicki to his career - high singles ranking of World No. 12 in June 2011 . What is the relationship between 'viktor troicki' and '2012 summer olympics'?
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participant of