22:10 CET - Our Flash Moment of the day from the men's side was an incredible rally between Daniil Medvedev (27) and Adrian Mannarino (34). The Russian won the point but lost the match 4-6, 6-4, 6-2.
21:21 CET - That's all for the day's play across the ATP and WTA tournaments. Tune in to the Tennis Tracker again tomorrow as it's quarter-final time in Den Bosch, Stuttgart and Nottingham.
You can see the men's schedule at the Libema Open here and the women's here.
Check out the program for the men in Stuttgart here and the ladies in Nottingham here.
19:55 CET - Swiss teen Celine Naef (17) has continued her good run in the Netherlands by beating Caty McNally (21) 3-6, 6-4, 6-3.
Naef defeated Venus Williams (42) in the fifth round and will next meet top seed Veronika Kudermetova (26) in the quarters tomorrow. Can she make it one more upset?
19:45 CET - Top seed Stefanos Tsitsipas (24) has been dumped out of Stuttgart by veteran Richard Gasquet (36) who recorded his 600th career win. Their match finished 7-6(10/8), 2-6, 7-5.
Gasquet will next face Jan-Lennard Struff (33) in the quarters.
18:18 CET - In one of the tightest two-set matches you'll see, Jan-Lennard Struff (33) has beaten Tommy Paul (26) 7-6, 7-6 in Stuttgart.
In Den Bosch meanwhile, Bianca Andreescu (22) has lost to Viktoria Hruncakova (25), 7-6, 6-3.
16:35 CET - Harriet Dart (26) has upset fifth seed Anhelina Kalinina (26) 6-0, 7-5 in Nottingham to book a quarter-final spot.
15:12 CET - In his first grass-court game of the year, world number eight Taylor Fritz (25) has beaten Aslan Karatsev (29) 7-6, 6-3 in Stuttgart.
14:50 CET - There's been an upset in Den Bosch, with top seed Daniil Medvedev (27) being knocked out by Adrian Mannarino (34), losing 4-6, 6-4, 6-2.
14:28 CET - Fourth seed Ekaterina Alexandrova (28) has beaten Kimberly Birrell (25) in Den Bosch, winning 6-4, 7-6.
13:20 CET - The first matches of the day have finished, with Tallon Griekspoor (26) beating Alexei Popyrin (23) and Emina Bektas (30) knocking out Sachia Vickery (28) at Hertogenbosch, and Martin Fucsovics (31) winning against Wu Yibing (23) in Stuttgart.
11:37 CET - Spanish veteran Feliciano Lopez (41), who will retire this season after 25 years on the ATP Tour, has been appointed tournament director of the Davis Cup Finals.
11:25 CET - Play is underway across the grass-court tournaments around Europe. You can take a look at the schedule of matches at the men's tournament in Den Bosch here and Stuttgart here.
Check out the ladies' program in the Netherlands here and Nottingham here.
07:45 CET - Hello and welcome to our coverage of today's tennis; we'll bring you updates from games in Stuttgart, Den Bosch and Nottingham and all the latest news.