22:00 CET - That's all from us today on the Tennis Tracker, but be sure to tune in again tomorrow for more drama from Queen's, Halle, Nottingham and Berlin!
21:42 CET - The last match of the day in Nottingham has come to an end, and it's another big upset!
Top seed Beatriz Haddad Maia has been dumped out by McCartney Kessler, who won their epic clash 7-5, 6-7, 7-5.
You can catch up on the day in Nottingham here.
21:22 CET - Play has ended for the day at Queen's with two matches just wrapped up. The big news is that third seed Taylor Fritz has been knocked out of the tournament by Corentin Moutet, who edged their first-round match 6-7, 7-6, 7-5.
In the other late result, Gabriel Diallo has beaten Billy Harris 6-1, 3-6, 6-4 to advance to the second round.
Catch up on the day's play at Queen's here.
20:05 CET - Moving back to Berlin, where, in the last match of the day, Elena Rybakina has beaten Ashlyn Kreuger 6-3, 7-6 to advance to the second round and complete the last-16 bracket.
Check out all the scores from Berlin here.
19:00 CET - The final two matches of day two at Halle have come to an end. Firstly, Felix Auger-Aliassime came through a battle against Serbian Laslo Djere to claim a 6-3, 6-7 (6-8), 6-1.
And Lorenzo Sonego won more comfortably against veteran Jan-Lennard Struff, winning 6-3, 6-2.
Catch up on all the results from Halle here.
18:30 CET - Talented young player Diana Shnaider has got her Berlin campaign off to a winning start with an impressive 6-2, 6-4 win against Donna Vekic.
18:10 CET - Soon after the world number two progressed in Germany, Carlos Alcaraz won his opening match at Queen's Club against Adam Walton, who provided a tough test for the newly crowned French Open champion.
Alcaraz, though, kept his composure and got the job done in a second-set tiebreak to win 6-4, 7-6 (7-4).
17:52 CET - Meanwhile, Arthur Rinderknech has stunned world number 10 Ben Shelton 7-6 (7-5), 7-6 (7-4) to progress at Queen's.
17:50 CET - World number one Jannik Sinner has responded to losing the French Open final with a confidence-boosting 7-5, 6-3 win against Germany's Yannick Hanfmann.
17:30 CET - The talented young American Amanda Anisimova has stormed past Berlin wildcard Bianca Andreescu 6-4, 6-3.
16:52 CET - Lastly for now, 2023 Wimbledon champion Marketa Vondrousova has produced a bit of a shock to defeat seventh seed Madison Keys, who continues to struggle on grass after an underwhelming Wimbledon last year.
Vondrousova won 7-5, 7-6 (8-6) to progress.
16:43 CET - Some breaking news to bring you as world number four Qinwen Zheng has withdrawn from Berlin through injury against Elena Rybakina after reaching the semi-finals at the historic Queen's Club last week.
Rybakina will now face American Ashlyn Krueger from 18:00 CET.
16:40 CET - The sixth seed at Halle, Ugo Humbert, has been knocked out in his opening round match against big-hitter Denis Shapovalov, who won 6-4, 4-6, 7-6 (7-4).
16:30 CET - On this busy day of opening round action, a couple of big names to progress in Halle are rising stars Joao Fonseca and Alex Michelsen.
Back to Queen's and Alexei Popyrin has won a thrilling all-Australian encounter against Aleksandar Vukic after responding well to losing an epic second-set tiebreak and winning the deciding set tiebreak.
A memorable match for the history books of this storied competition.
Vukic came out on top 6-2, 6-7 (9-11), 7-6 (7-3).
16:17 CET - Britain's number one and world number six Jack Draper has come through what could have been a banana skin unscathed with a dominant 6-3, 6-1 win against American Jenson Brooksby.
Meanwhile, Britain's number two on the women's side, Katie Boulter, won comfortably in her opening match in Nottingham against Lulu Sun, winning 6-2, 6-2.
14:38 CET - The first major shock of the day comes from Queen's as fifth seed Alex De Minaur loses in straight sets against Jiri Lehecka, whose stock continues to rise.
The talented Czech player won 6-4, 6-2 to book his place in the second round.
14:18 CET - A fascinating battle to start the day in Berlin between two top players saw world number 20 and former champion Liudmila Samsonova come from a set down to knock out Naomi Osaka 3-6, 7-6 (7-3), 6-4.
Just minutes later in Nottingham, British player Sonay Kartal booked her place in the second round after beating Leolia Jeanjean 6-3, 6-4.
And Francesca Jones has won an all-British affair against Harriet Dart 7-5, 6-4 to progress.
14:00 CET - Carlos Alcaraz will have a new opponent this afternoon at Queen's after Davidovich Fokina withdrew from the tournament.
In his first game since dramatically winning the French Open title, Alcaraz will now play lucky loser Adam Walton.
Meanwhile, back in Halle, world number 23 Tomas Machac has come through a battle against Dutchman Jesper De Jong to progress, ultimately winning 7-5, 3-6, 6-3.
And over in Nottingham, the first match of the day has reached a conclusion as Magda Linette defeats talented young Filipino Alexandra Eala 6-4, 6-3.
13:15 CET - Returning to Halle, Argentine Tomas Martin Etcheverry has defeated Pedro Martinez 6-1, 6-3 to progress to the second round.
Next up for Etcheverry is a tough test, taking on fourth seed Andrey Rublev, who earlier won.
13:02 CET - The first match to finish in Berlin has seen Xinyu Wang cause a mini upset by defeating Aussie number one Daria Kasatkina 6-3, 6-2.
12:45 CET - The first match of the day has been won by Andrey Rublev in Halle after the fourth seed cruised to a 6-3, 6-4 win against Sebastian Ofner.
11:40 CET - The waiting is over as play is underway in Halle as Jesper De Jong serves first against Tomas Machac.
Play is also underway in Berlin as Naomi Osaka takes on Liudmila Samsonova in an intriguing opening game.
07:30 CET - Hello and welcome back for another big day of grass court action from Germany and England.
With a host of stars in action today, I hope you are comfortable at home for what promises to be a thrilling day.
First up this morning, world number 14 Andrey Rublev takes on Austrian Sebastian Ofner in Halle, whilst former world number one Naomi Osaka faces Liudmila Samsonova in Berlin, both from 11:30 CET.
Headlining this afternoon on the ATP tour is world number six Jack Draper and world number two Carlos Alcaraz at Queen's, and world number one Jannik Sinner at Halle.
Heading the WTA tour this afternoon from Berlin is Madison Keys, followed by a clash between Elena Rybakina and Olympic champion Qinwen Zheng.
Follow all the action today from Halle, Berlin, Nottingham and Queen's here.