2020 Australian Open – Men's singles

Defending champion Novak Djokovic defeated Dominic Thiem in the final, 6–4, 4–6, 2–6, 6–3, 6–4 to win the men's singles tennis title at the 2020 Australian Open. It was his record-extending eighth Australian Open title and 17th major title overall. With the win, Djokovic regained the world No. 1 singles ranking, and became the first player since Ken Rosewall to win major titles in three different decades. The match also marked the first time Djokovic came back to win a major final after trailing two sets to one, having lost each of the last seven times this happened. Thiem became the first Austrian to reach the final. This was Thiem's third runner-up finish in as many major finals (though he would go on to win the US Open later that year). The final also marked the first time in the Open Era that three consecutive men's major finals went to five sets, following the finals at the 2019 Wimbledon Championships and the 2019 US Open.

This marked the final Australian Open appearance for former world No. 1, six-time champion, and 20-time major champion Roger Federer. With his third-round win, Federer became the first player to win 100 matches at the Australian Open. He also became the first player to earn 100 match wins at two majors (the other being Wimbledon). Federer's semifinal encounter with Djokovic marked their 50th and final professional meeting; Djokovic won to end their head-to-head at 27–23 in his favor. This was also the first Australian Open appearance for future world No. 1 and two-time champion Jannik Sinner; he lost to Márton Fucsovics in the second round.