Tennis: Djokovic, Kyrgios and others sue ATP and WTA Tours Sport Business Novak Djokovic, Nick Kyrgios and other tennis stars are suing the ATP and WTA Tours, as well as the International Tennis Federation, in multiple jurisdictions. The striking move comes as part of a wider claim from the Professional Tennis Players Association, the organisation set up by 24-time Grand Slam winner Djokovic in conjunction with former [...]