12:15 CET - We're just under a couple of hours away from a heavyweight ATP 500 final in Vienna between the top two seeds, Jannik Sinner and Alexander Zverev.
It's a head-to-head which Zverev surprisingly leads 4-3, although their most recent meeting was an emphatic victory for Sinner in this year's Australian Open showpiece.
Follow the match with Flashscore here.
Meanwhile, in Basel, Brazilian teen Joao Fonseca comes up against Spain's Alejandro Davidovich Fokina, with both players targeting the biggest title of their careers.
Keep track of that clash from 15:30 CET.
10:53 CET - Ann Li is the champion in Guangzhou, with the American proving too strong for Lulu Sun in a straight sets victory, 7-6(6), 6-2.
10:16 CET - Second seed Ann Li is closing in on the title in Guangzhou after the American battled through a fiercely competitive opening set to take it 7-6(6) over Lulu Sun.
Follow the second set with Flashscore here.
08:09 CET - We've already had our first winner of the day, with Belinda Bencic clinching the title in Tokyo after a dominant 6-2, 6-3 victory over Czech rising star Linda Noskova.
Bencic - who started the 2025 season ranked 421 after returning from maternity leave - picks up her 10th career title, and will rise to world number 11 as a result.
08:00 CET - Good morning and welcome to our coverage of today's finals in Vienna, Basel, Tokyo and Guangzhou!