Garbine Muguruza, 30, was ranked World No 1 in 2017 and was ranked as high as third by the end of 2021.
Dokic's father Damir told a newspaper that he had spoken to his daughter "10 or 15 days ago" and she had told him she would not play in Australia.
While Federer and Nadal will look to reignite the flair and fight they showed to reach last year's final, 2018 could have a different script at play.
Veteran Indian tennis star Leander Paes and his Swiss partner Martina Hingis sailed into the quarter-finals of the mixed doubles event at the Australian Open with straight sets win over Australian duo Matt Reid and Casey Dellacqua, in Melbourne on Monday.
Novak Djokovic will prepare for a tilt at an 11th Australian Open title by representing Serbia at the United Cup mixed team tournament while old rival Rafael Nadal and former women's world number one Naomi Osaka return at Brisbane after time away.
Images from Day 4 of the 2024 Australian Open in Melbourne on Wednesday.
Photos of celebrities who watched the Australian Open men's final between Rafa Nadal and Stanislas Wawrinka.
India's challenge at the 2010 Australian Open Squash Championship came to a premature end on Wednesday after unseeded Dipika Pallikal bowed out in the first round of the tournament in Canberra.
Normal service resumed at the Australian Open on Saturday as Roger Federer and Serena Williams booked their places in the second week of the championship.
Images from Day 1 of the Australian Open.
Hungarian Timea Babos and France's Kristina Mladenovic defeated Russian duo Ekaterina Makarova and Elena Vesnina 6-4, 6-3 to win the women's doubles title at the Australian Open on Friday.
Sumit Nagal won the Heilbronner Neckarcup ATP Challenger event beating Alexander Ritschard of Switzerland
Rafter, who turns 31 on Sunday, is not planning a comeback to the professional circuit.
Images from the US Open women's singles first round matches, at Flushing Meadows, New York, on Tuesday.