Alex De Minaur defeated the World no.1 6-4, 6-4 to give the host nation a 1-0 lead in their quarter-final tie against Serbia at the mixed teams event. Novak was broken once in each set, suffering his first defeat on Australian soil after six years and 43 consecutive wins.

Marketa Vondrousova earned a close win for the Czech Republic in the opening match of the day, when she beat Olga Danilovic 6-1, 3-6, 6-3. Novak then outplayed Jiri Lehecka 6-1, 6-7, 6-1 to even the tie. In the deciding mixed doubles match, Olga teamed with Hamad Medjedovic. The Serbian duo defeated Miriam Kolodziejova and Petr Nouza 4-6, 7-5, 10-8 to send their Team through to the United Cup quarterfinals.

Laslo Djere opened the tie with a 6-4, 6-4 win against Albert Ramos-Vinolas to give Serbia a 1-0 lead against hosts Spain, then Novak Djokovic continued his winning ways with a 6-3, 6-4 victory against Alejandro Davidovich Fokina.

Novak did double duty in the Davis Cup semis on Friday, but it was not enough to give a victory to the 2010 champions Serbia. Gojo won the opening singles rubber against Lajovic 4-6, 6-3, 6-2. Nole leveled the tie beating Marin Cilic 6-4, 6-2, but in the deciding doubles, the world no.1 pair Mektic/Pavic defeated Djokovic and Krajinovic 7-5, 6-1.

Serbia is through to the Davis Cup semis following a comeback 2-1 win over Kazakhstan. Kukushkin clinched the opening point beating Kecmanovic 7-6, 4-6, 7-6. Novak then recorded a 6-3, 6-4 victory over Alexander Bublik to level the tie. In the deciding doubles match, Nole and Cacic teamed up to defeat Golubev and Nedovyesov 6-2, 2-6, 6-3. Serbia will face Croatia at the Madrid Arena on Friday (16:00 CET).

Dusan Lajovic gave Serbia a 1-0 lead in their tie against Austria on Friday at the Davis Cup Finals, beating Gerald Melzer 7-6 (5), 3-6, 7-5. Novak Djokovic backed up the win, toppling Dennis Novak 6-3, 6-2.

Novak claimed his 83rd career singles title and his third crown in Belgrade, following a 6-4, 6-3 victory over Alex Molcan in 88 minutes.

Novak made his 119th tour-level championship match (82-36) and his third final in 2021, as he recorded a 6-1, 4-6, 6-0 triumph over qualifier Andrej Martin.

Novak moved into the last four of the inaugural Belgrade Open, following a 6-1, 6-0 victory over Federico Coria. For a spot in the ATP 250 event final, the top seed will face qualifier Andrej Martin (SVK, ATP #119).

Novak recorded a 6-2, 7-6 (4) win over lucky loser Mats Moraing to progress into the last eight at the Belgrade Open. Next up for the world no.1, who is pursuing his second title of the season, is Federico Coria (ARG, Alt), currently ranked no.96 in the ATP Rankings.