The issue of preferential treatment being afforded to the tennis elite refuses to go away with more players hitting out at Australian Open organisers after CEO Craig Tiley offered justification for the greater freedoms the Adelaide contingent is enjoying. Serena Williams, Novak Djokovic, Rafael Nadal and other big names remain in South Australia ahead of the February 8 grand slam, where they have significantly better preparation opportunity than their Melbourne-based peers - 72 of whom remain in hard lockdown. Those based in Adelaide have been permitted larger entourages - Williams travelling with her husband, daughter and mother as well as hitting partners. Nadal is understood to have his father, manager and trainers with him though his coach opted to remain at home.