2024 Australian Open – Men's singles
Jannik Sinner defeated Daniil Medvedev in the final, 3–6, 3–6, 6–4, 6–4, 6–3 to win the men's singles tennis title at the 2024 Australian Open. It was his first major singles title. Sinner was the second Italian man in the Open Era to win a singles major, after Adriano Panatta at the 1976 French Open. He was the first new Australian Open men's singles champion since Stan Wawrinka in 2014. Medvedev lost the final after winning the first two sets, making him the only player in the Open Era to lose two major finals after having a two-set lead and the second to lose all of his first three Australian Open finals, after Andy Murray. Medvedev also set Open Era records for the most time spent playing at one edition of a singles major, at 24 hours and 17 minutes, and for the most sets played in a singles major, at 31.
Novak Djokovic was the defending champion, but lost in the semifinals to Sinner. His loss ended a 33-match winning streak at the Australian Open, marked his first-ever defeat in an Australian Open semifinal after going 10–0 in his first 10, and first defeat in any major semifinal since the 2019 French Open, winning his last 12 consecutive major semifinals. Djokovic retained the world No. 1 singles ranking after Carlos Alcaraz lost in the quarterfinals; Medvedev was also in contention for the top spot.
A record number of seeded players advanced to the second round, for the first time since the introduction of the 32-seed system at the 2001 Wimbledon Championships. The tournament featured a record-equaling 35 five-set matches, tying the Open Era record set at the 1983 US Open.
This marked the final Australian Open appearances for five-time finalist, three-time major champion, two-time Olympic gold medalist, and former world No. 1 Andy Murray, and 2020 finalist, 2020 US Open champion, and former world No. 3 Dominic Thiem; both were defeated in the first round, by Tomás Martín Etcheverry and Félix Auger-Aliassime, respectively. It was also the final major appearance for former world No. 3 and 2016 Wimbledon finalist Milos Raonic, who lost to Alex de Minaur in the first round, Raonic would officially retire from tennis in 2026.
Seeded players
The following are the seeded players. Seedings are based on ATP rankings as of 8 January 2024. Rankings and points before are as of 15 January 2024.| Seed | Rank | Player | Points before | Points defending | Points won | Points after | Status |
| 1 | 1 |  Other entry informationWithdrawalsThe entry list was released by Tennis Australia based on the ATP rankings for the week of 4 December 2023.‡ – withdrew from entry list before qualifying began @ – withdrew from entry list after qualifying began § – withdrew from main draw |