Novak Djokovic’s lawyers have painted Australia’s effort to deport him as “irrational” and “unreasonable” in an eleventh-hour bid to reinstate the tennis star’s visa and allow him to remain in the country to defend his Australian Open crown. With just hours to go before the first ball is served at Melbourne Park, Djokovic’s high-powered legal team kicked off an emergency appeal in Australia’s Federal Court. The hearing will decide whether the Australian Open’s top seed and defending champion can retain his title and become the first male player in history to win 21 Grand Slams.