Some top tennis players are suing the sport’s governing bodies for allegedly running a cartel that caps prize money, limits off-court earnings and restricts competition from rival tournaments.

During his pre-tournament press conference, the current world No.7 used the opportunity to pay tribute to legendary Australian player Fred Stolle (who died on Thursday at the age of 86): "I would like to send my condolences to his family. It's never good news when a legend of our sport leaves us.