Fearsome foursome go to Australian Open aware the end could be near

Injuries and rise of a new generation threaten to expose Roger Federer, Rafael Nadal, Novak Djokovic and Andy Murray at the first slam of the year The four greatest players in modern tennis - who between them have won more than £300m across 16 years - arrive in Melbourne this week aware that their days as a dominant entity are numbered, if not already history. This could be Alexander Zverev's time, or maybe the 2019 Australian Open will belong to Stefanos Tsitsipas or Daniil Medvedev. And Austr...