Djokovic, 30, enters the 2018 Australian Open as the 14th seed, the first time he has been ranked outside the top 10 at the year's first Grand Slam in a decade, after missing much of 2017 with an elbow injury, reports Xinhua news agency.
Federer defeated Nadal in a memorable five-set final past year to win his 18th grand slam title, before later triumphing at Wimbledon.
Simona Halep is No. 1 in the women's draw, followed by Carolina Wozniacki and Garbine Muguruza.
Federer says his three-year-old sons Leo and Lenny "seem very interested" in tennis and that his eight-year-old daughters Myla Rose and Charlene Riva, also identical twins, think his friends in the locker-room like countryman Stan Wawrinka are all part of the family.
Third seed Grigor Dimitrov or eighth seed Jack Sock are possible semi-final opponents for the 16-time Grand Slam victor.
But his toughest test could come in the quarterfinals, where either in-form No.7 seed David Goffin - the Belgian who ended the Swiss star's ATP Finals run - or his US Open vanquisher, No.12 seed Juan Martin del Potro, are drawn to end up.
Former victor Stan Wawrinka, who hasn't played since Wimbledon but said he has recovered sufficiently from a knee injury, is seeded at nine. "I don't want to know who I play other than just seeing the sheet at the end and knowing who my first-round opponent is".
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Federer took his Grand Slam tally to 19 after extended rest breaks and Nadal, who enters his 18th season on the ATP tour, has also benefitted from carefully picking tournaments to preserve his fitness.
Moya can take some credit for the vast improvement in Nadal's second serve, which helped the Spaniard win a 10th French Open title without dropping a set and saw him blow away Kevin Anderson to lift the final major of the year in NY.
A similar controversy blew up at the Auckland Classic this week when four players pulled out before their opening matches, citing injury or illness.
In the absence of Serena Williams and Victoria Azarenka, only two former champions are in the women's draw.
"Ranking points, player withdrawals and how we deal with that is something we've got to and are looking at", he told Fairfax Media in Auckland.
However, plans for a shot clock to enforce a 25-second time limit between points have been shelved, and will only be used in the qualifying tournament at Melbourne Park.
Berdych, the 17th seed, has never lost to an Australian at a Grand Slam in seven matches.