Novak Djokovic and Rafael Nadal have been fierce rivals on the tennis court throughout their careers - but the Serbian has explained why the pair could never be friends.

Rafael Nadal has announced his retirement from professional tennis, with the Spaniard's great rival Novak Djokovic having previously opened up on their relationship

As Rafael Nadal prepared to serve in what turned out to be the last tennis match of his career, a woman’s voice broke the silence from the stands: “You make Spain proud!” Not long after that, Nadal was wiping away tears from his face and waving goodbye to his fans.