Fourth seed Jannik Sinner recorded his first ever win over Novak Djokovic 7-5, 6-7, 7-6, to hand the world no.1 his first loss since Wimbledon. The defending champion will look to book his place in the last four when he meets alternate Hubert Hurkacz in the final round-robin match on Thursday.
Novak improved to 2-0 in Red Group at the Nitto ATP Finals on Wednesday, following a convincing 6-4, 6-1 win over sixth seed Andrey Rublev in just 67 minutes. He will face fourth seed Daniil Medvedev (H2H 7-4) in his final round-robin match on Friday at 14:00 CET.
Serbia is through to the quarter-finals of the Davis Cup as one of the two best runners-up. The 2010 champions will meet Kazakhstan on Wednesday, December 1.
Top seed and five-time former champion failed in attempt to score his second win in as many matches at the 2020 season finale in London, as he was defeated by no.4 seed Daniil Medvedev 3-6, 3-6 in one hour and 21 minutes at The O2 Arena. Novak will look to book his place in the last four when he meets Alexander Zverev (GER, 6) on Friday.
The Austrian rallied to beat Novak 6-7 (5), 6-3, 7-6 (5), and made his first Nitto ATP Finals semis. Djokovic will face no.3 seed and six-time titlist Roger Federer (SUI) on Thursday, for a spot in the last four.