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Nick Kyrgios is one of tennis's most recognisable and divisive figures, known both for flashes of brilliant on-court talent and for a career repeatedly disrupted by injuries, disciplinary run-ins and outspoken behaviour. The Australian player, now 31, has never quite matched his obvious ability with sustained success at the top level, and recent years have seen him play only sporadically because of ongoing fitness problems.

Professional tennis, like most elite sports, operates an anti-doping system in which players are tested for banned substances, with positive results normally leading to some form of sanction from the sport's governing bodies. Cocaine is classed as a prohibited substance under these rules, though it is typically treated differently to performance-enhancing drugs, as it is not considered to improve athletic performance.

Kyrgios has now disclosed, in his own words, that he failed a drugs test for cocaine and served a ban that was not made public at the time. This matters because it adds a new and more serious element to a career already shaped by controversy and uncertainty, and it raises questions about transparency in how such cases are handled and what, if anything, tennis authorities will do now that the matter is known publicly.