21:45 CET - That's all from us this evening on the Tennis Tracker, but be sure to tune in again tomorrow as the semi-finals take place in London, Stuttgart and 's-Hertogenbosch!
21:15 CET - In the last match of the day at Queen's, and across the Tours, American Amanda Anisimova has upset compatriot and third seed Emma Navarro 6-3, 6-3.
Anisimova will next face top seed Zheng Qinwen in the semi-finals. Can she pull off another big surprise?
Catch up on the day's scores from Queen's here.
20:02 CET - In the last men's quarter-final in Den Bosch, Zizou Bergs has edged Mark Lajal 7-6, 7-6 to set up a semi-final with Reilly Opelka.
Catch up on all the men's scores from Den Bosch here.
19:36 CET - Top seed Zheng Qinwen is through to the semi-finals at the Queen's Club after reeling off four straight games at the end of the second set to secure a mightily impressive 6-2, 6-4 triumph over home favourite Emma Raducanu.
The Olympic champion will face either Emma Navarro or Amanda Anisimova in the last four. Follow their quarter-final clash in London here.
18:40 CET - Ben Shelton has set up a heavyweight semi-final with Alexander Zverev in Stuttgart after the American third seed defeated Jiri Lehecka 6-4, 6-4 in a relatively routine quarter-final.
Meanwhile, in Den Bosch, Elena Gabriela Ruse is through to the last four, with the Romanian easing past former US Open champion Bianca Andreescu in straight sets, 6-2, 6-4.
17:22 CET - And another upset to report, fourth seed Elena Rybakina is out of Queen's after losing to Tatjana Maria 6-4, 7-5.
The win sees the German veteran move into the semi-finals, where she will take on second seed Madison Keys.
17:14 CET - There's been a major upset in Den Bosch with top seed Daniil Medvedev being knocked out of the men's tournament by big-serving lucky loser Reilly Opelka.
The American edged the encounter 7-6, 7-6. Next up, he will face the winner of Zizou Bergs and Mark Lajal in the semi-finals. Coincidentally, Opelka lost to Lajal in the qualifiers.
16:41 CET - Top seed Alexander Zverev is into the semi-finals in Stuttgart after brushing aside Brandon Nakashima 7-5, 6-4.
Zverev will next take on the winner of Ben Shelton and Jiri Lehecka, who meet in the final quarter, for a spot in the title decider.
16:30 CET - Elisabetta Cocciaretto has beaten Suzan Lamens 6-2, 7-6 to book her spot in the final four in Den Bosch.
15:16 CET - Australian Open champion Madison Keys has come out on top in a tight tussle with Diana Shnaider, with the second seed winning 2-6, 6-3, 6-4 to seal her spot in the Queen's semi-finals.
Meanwhile, over in 's-Hertogenbosch, Elise Mertens progressed to the last four with a straight sets win.
14:36 CET - Canadian Gabriel Diallo has produced an upset in 's-Hertogenbosch, stunning second seed Karen Khachanov 7-6(6), 6-4 to reach the semi-finals. The big-serving 23-year-old could be set for a strong grass-court season.
14:26 CET - Taylor Fritz has set up a semi-final meeting with Felix Auger-Aliassime in Stuttgart, winning his last-eight clash against Marton Fucsovics in relatively straightforward fashion, 6-3, 6-4.
13:30 CET - Number two seed Ekaterina Alexandrova has outlasted Veronika Kudermetova in 's-Hertogenbosch, sealing her spot in the semi-finals after beating her fellow Russian 5-7, 6-4, 6-2.
12:49 CET - Felix Auger-Aliassime has booked his spot in the last four in Stuttgart, overcoming 17-year-old German Justin Engel, 7-6(3), 6-3. He continues his 100% record in quarter-finals this year, and awaits the winner between Taylor Fritz and Marton Fucsovics.
12:22 CET - Second seed Ugo Humbert is safely through to the semi-finals in 's-Hertogenbosch after a convincing 6-1, 6-4 triumph over Nuno Borges in just 67 minutes.
09:13 CET - Today's quarter-final action gets underway in just under two hours, as second seed Ugo Humbert takes on Nuno Borges in Den Bosch and Felix Auger-Aliassime comes up against home hope Justin Engel in Stuttgart.
There are plenty of big names involved a little later this afternoon, with Madison Keys, Elena Rybakina and Qinwen Zheng all taking to the court at Queen's, while Alexander Zverev looks to seal a semi-final spot in Germany.
Check out the full schedule for tournaments in London, Stuttgart, 's-Hertogenbosch (ATP) and 's-Hertogenbosch (WTA) via the links.
08:30 CET - Good morning and welcome to our coverage of today's tennis!