Novak Djokovic has admitted he is “sad” that most of his long-term rivals have retired from tennis. The 24-time Grand Slam winner namechecked Andy Murray, Roger Federer and Rafael Nadal before appearing in an exhibition match in Buenos Aires to mark Juan Martin del Potro’s retirement.

Novak Djokovic says his new coaching partnership with Andy Murray inspires him, and that he is sad to see his top rivals retire as he gears up to face Juan Martin del Potro in a farewell exhibition match in Buenos Aires.

Andy Roddick believes Andy Murray ranks above the likes of Roger Federer, Rafael Nadal and Novak Djokovic when it comes to his intelligence on the court. Murray failed to hit the heights of his three biggest rivals but was one of the few players to provide a sustained challenge while Federer,

Andy Roddick believes there was “zero reason” for the player-coach partnership between Novak Djokovic and Andy Murray to be announced shortly after Rafael Nadal’s retirement. The former world No 1 suggested Djokovic and Murray wanted to “dominate the headlines”,

Andy Murray has only been working with Novak Djokovic for a short period of time, but he has already felt comfortable enough to question his commitment.