18:02 CET - Elena Rybakina is a set to the good in the WTA Finals showpiece after taking it impressively 6-3 in 44 minutes against world number one Aryna Sabalenka!
Keep track of the second set here.
17:55 CET - Novak Djokovic fights back in Athens! The Serb has taken the second set 6-3 to send us into a decider.
Follow the third set right here.
17:02 CET - Musetti leads! The Italian has won the opener 6-4 after an early break, and is now just one set away from the Athens title and a spot in the ATP Finals.
16:12 CET - Novak Djokovic and Lorenzo Musetti are about to get underway in a high-stakes Athens final!
Follow point-by-point coverage here.
13:12 CET - Welcome back to Flashscore's Tennis Tracker as we guide you through all of the action this Saturday, and we have some crackers in store.
Novak Djokovic looks for his 101st ATP title this afternoon, as he takes on Lorenzo Musetti in Athens from 16:00 CET. His Italian opponent is chasing his third, but more importantly for him, if he beats the Serbian, he will qualify for the ATP Finals, starting in Turin on Monday.
The pair have faced 10 times over the years, with Djokovic coming out on top in nine of them. Musetti faces an uphill challenge, then, if he is to be victorious.
Follow all the action from Greece right here.
Elsewhere, from 16:30 CET, we have the final in Metz. Cameron Norrie is trying to get back into the winner's circle for the first time since 2023 as he faces Learner Tien. It's not been an easy road for Norrie on his way to the final, having needed three sets in all of his encounters this week. It's been slightly easier for the American, who has dropped just one set to get this far. It's a big day for Tien, too, as he has never won an ATP title.
Finally, and perhaps the biggest game of the day sees Aryna Sabalenka take on Elena Rybakina in Riyadh as the pair try to become the WTA Finals champion. It's already been a great week for the Belarusian, as she ensured she would end the year as number one for the second consecutive season.
But there is still plenty up for grabs, and for the Kazakh star, it is her first-ever final at this event. Both women have yet to taste glory in this tournament, meaning the pressure will be on from 17:00 CET.