Ex-Federer's coach warns Sinner: "The hip problem must not be underestimated"

There are injuries that are more difficult than others to overcome. Andy Murray and the serious hip injury comes to my mind, for example.And about this kind of physical problem, Ivan Ljubicic talked about the hip injury that is affecting Jannik Sinner, during an interview for Sky Sport 24.Roger Federer's former coach warned the young Italian champion that he should not underestimate this type of injury. It should be remembered that Ljubicic's interview was granted before Jannik decided to skip R