The Serbian had earlier suffered a shock defeat to Pablo Carreno Busta in the men's singles bronze medal match.
The Serbian player, who won the first three Grand Slams of the year, was defeated by Germany's Alexander Zverev in three sets.
"No one is born with those abilities. Those abilities come with time," said the tennis star.
The world No. 1 faces Canada's Denis Shapovalov, while No. 7 seed Matteo Berrettini takes on No. 14 seed Hubert Hurkacz.
Federer faces Poland's Hubert Hurkacz, the No. 14 seed, while Djokovic takes on unseeded Hungarian Marton Fucsovics.
The world No. 1 takes on Kevin Anderson in a repeat of the 2018 final, while Tiafoe faces Canada's Vasek Pospisil.
World No. 1 Novak Djokovic looks highly likely to equal the all-time record of 20 Grand Slam singles titles held by Roger Federer and Rafael Nadal.
"Well, I don't know the boy, but he was in my ear the entire match," said Djokovic, who won his 19th Grand Slam title with the win.
The world No. 1 stands between Nadal and a 14th final at Roland Garros, while Stefanos Tsitsipas takes on Alexander Zverev in the other semifinal.
The Spaniard's quest for a 14th French Open crowns begins on Tuesday, with world No.1 Novak Djokovic also on court.
Rafael Nadal chases a record 21st Grand Slam singles titles, while Serena Williams aims to equal Margaret Court's record of 24 Grand Slam crowns.
When it comes to optimal performance, you need to be of optimal mind and body.
Now that the young Greek Stefanos Tsitsipas is officially a tennis star after the French Open, you should learn how to say his name correctly.
Djokovic, the No. 1 seed in the tournament, was trailing Pablo Carreño Busta, 6-5, in the first set of a fourth-round match.
The world No. 1 competed in the Adria Tournament last week, but the final was canceled after a number of players tested positive to COVID-19.
Novak Djokovic, the No.1–ranked tennis player in the world, was recently seen in his hometown of Belgrade, Serbia, playing street tennis with three kids.
Novak Djokovic chases a second consecutive and an eighth overall title in Melbourne, while Dominic Thiem looks for a first Grand Slam title
The winners of the last five Australian Opens meet in the semifinals at Melbourne Park for the first time since 2016.
Federer takes on Tennys Sandgren of the U.S., while Djokovic faces No. 32 seed Milos Raonic of Canada.
The world No. 1 takes on Spain's Pablo Carreno Busta, while Medvedev plays Australia's Alexei Popyrin.
Williams faces China's Wang Qiang, while Federer takes on Australia's John Millman and Coco Gauff plays Naomi Osaka.
Williams faces Slovenia's Tamara Zidansek, while Federer takes on Serbia's Filip Krajinovic and Djokovic plays Japan's wild card Tatsuma Ito.
The first Grand Slam of the season begins in Melbourne on Monday, with some of the tournament favorites all in action.
The 108th edition of the Australian Open gets underway in Melbourne on Monday, with the women's and men's final scheduled for the first weekend of February.
Novak Djokovic and Serena Williams are the bookmakers' favorite to add an eighth Australian Open title to their collections this year.
The first Grand Slam tournament of 2020 gets underway on January 20 in Melbourne with Novak Djokovic and Naomi Osaka looking to defend their titles.
Roger Federer, Novak Djokovic, Rafael Nadal and Serena Williams are among the players in action in the fundraiser for the victims of the bushfires.
Nadal takes on 2014 U.S. Open winner Marin Cilic while Osaka plays No. 13 seed Belinda Bencic on Monday.
Federer takes on Britain's Dan Evans, while Djokovic faces American qualifier Denis Kudla on Friday evening.
Coco Gauff plays Hungary's Timea Babos, while Rafael Nadal takes on Australia's Thanasi Kokkinakis on Thursday.