21:38 CET - Auger-Aliassime takes the first set! The Canadian has won it 6-4, thanks to a break of serve in the final game. Before that game, he didn't have a single break point, while Zverev had two, but unlike the German, he took his chance.
20:30 CET - Who will be the fourth semi-finalist at the 2025 ATP Finals? It's time to find out.
Alexander Zverev and Felix Auger-Aliassime are taking to the court for a winner-takes-all clash that will see the victor advance to the final four.
Zverev leads the H2H 6-3 in competitive matches, but Auger-Aliassime prevailed when they met at the US Open a few months ago, and has been in top form. This one could go either way.
Follow every point of the match here.
19:22 CET - British doubles pair Joe Salisbury and Neal Skupski made it three wins from three in the John McEnroe Group in Turin, after a 7-5, 6-3 victory over Christian Harrison and Evan King.
18:25 CET - A couple more results to bring you from the BJK Cup playoffs, with Iga Swiatek thrashing Elyse Tse 6-0, 6-1 in just 45 minutes to give Poland a 2-0 lead over New Zealand, while Linda Noskova has secured the win for Czechia over Colombia after a 6-2, 6-2 triumph against Camila Osorio.
16:53 CET - There's been plenty of BJK Cup action this afternoon, with Slovenia taking an unassailable 2-0 lead over the Netherlands thanks to wins from Tamara Zidansek and Kaja Juvan.
Elsewhere, Germany lead Turkey after Ella Seidel's 6-1, 6-1 dismantling of Berfu Cengiz, while Czechia's Linda Noskova is currently on court against Camila Osorio of Colombia. Follow that match right here.
16:18 CET - Defending champion and home hope Jannik Sinner has made it three wins from three in the Bjorn Borg Group, with the Italian seeing off Ben Shelton in two competitive sets, 6-3, 7-6(3).
Sinner, who extends his remarkable winning streak on indoor hard courts to 29 matches, will next face Alex de Minaur in tomorrow's semi-finals in Turin.
15:13 CET - First blood to Jannik Sinner in his pool match against Ben Shelton. The Italian, who will meet the second-placed person from the Jimmy Connors Group, won the first set 6-3.
14:28 CET - Our first singles clash of the day is now underway at the ATP Finals, as winner of the Bjorn Borg Group, Jannik Sinner, takes on already-eliminated Ben Shelton.
The Italian leads a one-sided head-to-head record 7-1, and is the heavy favourite to make it three wins from three in Turin.
Follow point-by-point coverage here.
13:39 CET - Harri Heliovaara and Henry Patten are through to the semi-finals in Turin after the doubles pair proved too strong for Marcelo Arevalo and Mate Pavic in straight sets, 7-6(5), 6-2.
11:30 CET - Good morning and welcome to our coverage of today's tennis at the ATP Finals, as well as updates from the BJK Cup playoffs.
The opening singles match of the day in Turin is a dead rubber, with group winner Jannik Sinner taking on Ben Shelton, who is already eliminated from the tournament, at 14:00 CET.
Later on, at 20:30 CET, Alexander Zverev comes up against Felix Auger-Aliassime, as both men target a win that would see them progress to the semi-finals.
Meanwhile, the BJK Cup playoffs get started today, and Australia have already secured a victory over Portugal, with Maya Joint and Kimberly Birrell winning their respective singles matches.