2017 Australian Open – Men's singles

Roger Federer defeated Rafael Nadal in the final, 6–4, 3–6, 6–1, 3–6, 6–3 to win the men's singles tennis title at the 2017 Australian Open. It was his fifth Australian Open title and record-extending 18th major title overall. Federer became the oldest men's singles major champion since Ken Rosewall at the 1972 Australian Open. Nadal was attempting to become the first man in the Open Era to achieve a double career Grand Slam (he would achieve the feat five years later).

Novak Djokovic was the two-time defending champion, but lost in the second round to Denis Istomin. It was the first time since the 2008 Wimbledon Championships that Djokovic failed to reach the third round of a major and the first time since 2006 that he failed to do so at the Australian Open. With top seed Andy Murray losing in the fourth round, this marked the first time since the 2004 French Open that the top two seeds both failed to reach the quarterfinals of a men's singles major.

This marked the first major tournament for future world No. 1 and US Open champion Daniil Medvedev; he lost in the first round to Ernesto Escobedo.

Seeds
🇬🇧 Andy Murray (fourth round) 🇷🇸 Novak Djokovic (second round) 🇨🇦 Milos Raonic (quarterfinals) Stan Wawrinka (semifinals) 🇯🇵 Kei Nishikori (fourth round) 🇫🇷 Gaël Monfils (fourth round) Marin Čilić (second round) 🇦🇹 Dominic Thiem (fourth round) 🇪🇸 Rafael Nadal (final) 🇨🇿 Tomáš Berdych (third round) 🇧🇪 David Goffin (quarterfinals) 🇫🇷 Jo-Wilfried Tsonga (quarterfinals) 🇪🇸 Roberto Bautista Agut (fourth round) 🇦🇺 Nick Kyrgios (second round) 🇧🇬 Grigor Dimitrov (semifinals) 🇫🇷 Lucas Pouille (first round)

 Roger Federer (champion) 🇫🇷 Richard Gasquet (third round) 🇺🇸 John Isner (second round) Ivo Karlović (third round) 🇪🇸 David Ferrer (third round) Pablo Cuevas (first round) 🇺🇸 Jack Sock (third round) 🇩🇪 Alexander Zverev (third round) 🇫🇷 Gilles Simon (third round) 🇪🇸 Albert Ramos-Viñolas (first round) 🇦🇺 Bernard Tomic (third round) 🇪🇸 Feliciano López (first round) 🇷🇸 Viktor Troicki (third round) 🇪🇸 Pablo Carreño Busta (third round) 🇺🇸 Sam Querrey (third round) 🇩🇪 Philipp Kohlschreiber (third round)

Seeded players
The following are the seeded players and notable players who withdrew from the event. Seeding are arranged according to rankings on 9 January 2017, while ranking and points before are as of 16 January 2017.

Wildcards
• 🇦🇺 Alex de Minaur

• 🇦🇺 Sam Groth

• 🇫🇷 Quentin Halys

• 🇺🇿 Denis Istomin

• 🇦🇺 Omar Jasika

• 🇺🇸 Michael Mmoh

• 🇦🇺 Christopher O'Connell

• 🇦🇺 Andrew Whittington

Protected ranking
• 🇩🇪 Tommy Haas (25)

• 🇵🇱 Jerzy Janowicz (94)

• 🇷🇺 Dmitry Tursunov (89)

Qualifiers
• 🇦🇺 Alex Bolt

• 🇰🇿 Alexander Bublik

• Ivan Dodig

• 🇺🇸 Ernesto Escobedo

• 🇮🇹 Thomas Fabbiano

• 🇺🇸 Bjorn Fratangelo

• 🇸🇰 Lukáš Lacko

• 🇦🇹 Jürgen Melzer

• 🇦🇺 Blake Mott

• 🇺🇸 Reilly Opelka

• 🇺🇸 Noah Rubin

• 🇷🇺 Andrey Rublev

• 🇯🇵 Go Soeda

• 🇨🇿 Radek Štěpánek

• 🇺🇸 Frances Tiafoe

• 🇮🇹 Luca Vanni

Lucky losers
• 🇨🇦 Peter Polansky

Withdrawals
• 🇦🇷 Juan Mónaco (65) → replaced by 🇯🇵 Yoshihito Nishioka (100)

• 🇦🇷 Juan Martín del Potro (38) → replaced by 🇬🇧 Aljaž Bedene (101)

• 🇱🇹 Ričardas Berankis (92) → replaced by 🇩🇴 Víctor Estrella Burgos (102)

• 🇪🇸 Tommy Robredo (57 PR) → replaced by 🇦🇺 James Duckworth (103)

• Kevin Anderson (67) → replaced by 🇰🇷 Chung Hyeon (104)

• 🇦🇺 John Millman (84) → replaced by 🇺🇸 Jared Donaldson (105)

• 🇦🇺 Thanasi Kokkinakis (81 PR) → replaced by 🇨🇦 Peter Polansky (LL)

Retirements
• 🇪🇸 Nicolás Almagro

• 🇩🇪 Tommy Haas

• 🇨🇦 Peter Polansky

• 🇮🇹 Luca Vanni

• 🇷🇺 Mikhail Youzhny