20:42 CET - Jasmine Paolini is the final person to make it into Stuttgart's semi-finals with a surprising 6-4, 6-3 victory over Coco Gauff.
Those two semis will be played tomorrow before the showpiece event on Monday.
18:38 CET - World number one Aryna Sabalenka is through to her third Stuttgart semi-final, with the Belarusian seeing off Elise Mertens in straight sets, 6-4, 6-1.
18:11 CET - Top seed Elina Svitolina is into the Rouen final, where she will play Olga Danilovic tomorrow, after beating Gabriela Ruse in straight sets 6-0, 6-2.
17:52 CET - Home favourite Alexander Zverev has progressed to the final in Munich after battling through a tight opening set to defeat Fabian Marozsan 7-6(3), 6-3.
17:45 CET - Top seed Carlos Alcaraz was back to his very best this afternoon in Barcelona, sweeping aside Arthur Fils in straight sets, 6-2, 6-4 to seal his place in tomorrow's final.
The Spaniard has now won 14 straight matches in Barcelona and will compete in his 24th ATP showpiece.
16:43 CET - Rouen third seed Olga Danilovic has lived up to her seeded expectations by making tomorrow's final with a 6-4, 6-4 victory over Suzan Lamene
16:29 CET - Jelena Ostapenko's remarkable run against Iga Swiatek has continued in Stuttgart as the Latvian wins her sixth match against the Polish world number two. This time, Ostapenko needed three sets to secure the victory, with a 6-3, 3-6, 6-2 victory.
15:48 CET - What a week it has been for Ben Shelton. Fighting off match points in his opening match in Munich, the second seed is now in the final, having produced a spirited comeback against Francisco Cerundolo. The American has won their encounter 2-6, 7-6(7), 6-4.
14:51 CET - Holger Rune is into the final in Barcelona! The Danish sixth seed needed just two sets to beat Karen Khachanov, winning their encounter 6-3, 6-2. He will face either Carlos Alcaraz or Arthur Fils, who play later today.
13:47 CET - Ekaterina Alexandrova is our first semi-finalist in Stuttgart after she dismantled Jessica Pegula in straight sets 6-0, 6-4 to go into the final four.
12:43 CET - Play is now underway in Stuttgart, with third seed Jessica Pegula taking on Ekaterina Alexandrova for a spot in the semi-finals.
Follow that match with Flashscore here.
09:54 CET - There are four blockbuster quarter-finals in Stuttgart today, including Coco Gauff against Jasmine Paolini, top seed Aryna Sabalenka taking on Elise Mertens and Iga Swiatek's clash with nemesis Jelena Ostapenko.
Jessica Pegula gets proceedings underway in Germany at 12:30 CET when she takes on Ekaterina Alexandrova.
Meanwhile, on the ATP Tour, it's semi-final day in Barcelona and Munich, with Carlos Alcaraz taking on Arthur Fils in Catalonia and Alexander Zverev looking to seal a final berth on home soil.
Check out the full schedules in Barcelona, Stuttgart, Munich and Rouen via the links.
07:40 CET - Good morning and welcome to our coverage of today's tennis!
