Categories this year included a wide range of topics from Architecture to the Natural World, Portraiture and Landscape, with entries from from 183 countries.
The American's absence from the sport will be closely felt as Maria Sharapova prepares for her comeback.
Peter Fleming believes Spaniard will be unsettled by the announcement of Toni Nadal's looming exit.
Dimitrov has already played 18 matches in 2017.
Andy Murray, Tomas Berdych and Boris Becker have also praised Federer's performance in Melbourne.
The Spaniard's uncle will focus on coaching in Nadal's academy after responsibilities dwindle.
Becker also claimed that the more Federer wins, the more he will want to play.
Berdych says he can't tell if he was good or bad in his 6-2, 6-4, 6-4 loss to Federer.
Dimitrov's win on home soil is his second title in 2017.
Williams is now one Grand Slam away from tying Margaret Court's record of 24.
Nadal has been advised to take an extended break by his doctors.
The 21-year-old is currently the world number 13.
Murray lost in the fourth round of the Australian Open against Mischa Zverev.
Dimitrov will now make his debut at the Garanti Koza Open.
Dimitrov lost the Australian Open semi-final in a five set thriller to Rafael Nadal.
Serena won her 23rd grand slam singles title, beating her sister Venus in the final at the Australian Open.
The Spaniard is confident reaching the final in Melbourne can trigger impressive year.
Federer and Nadal are meeting for the 35th time in their careers.
Seventeen-time champion Federer reaches final after missing last six months of 2016.
The Spaniard beats Dimitrov 6-3 5-7 7-6 (7-5) 6-7 (4-7) 6-4 in semi-final.
Serena and Venus Williams have a combined 61 Grand Slam titles between them including doubles and mixed doubles.
Federer booked a place in the finals of the 2017 Australian Open after beating Stan Wawrinka.