17:17 CET - There has been yet another retirement on the ATP Tour today, this time benefiting Joao Fonseca. The Brazilian 19-year-old has progressed into the Basel semi-finals after Denis Shapovalov retired when trailing 3-6, 6-3, 4-1.
Fonseca will now face Jaume Munar in the biggest semi-final of his career.
16:20 CET - Shuai Zhang is the last player to book a semi-final spot in Guangzhou after winning 7-6 (7-5), 5-7, 7-5 against Katie Volynets.
15:40 CET - Alexander Zverev is into the Vienna semi-finals without even having to pick up a racket, as his opponent, Tallon Griekspoor, withdrew from the contest with a back injury.
As a result, Zverev has also sealed his place at the ATP Finals in Turin!
15:24 CET - Alex De Minaur has booked his spot in the Vienna semi-finals after a strong 6-1, 7-6(4) victory over big-serving Matteo Berrettini.
15:00 CET - Jaume Munar is into the last four in Basel after his opponent, Felix Auger-Aliassime, retired from the contest with an injury after losing the first set 6-3.
13:27 CET - Belinda Bencic has been struggling to go deep in competitions lately, but a big victory against rival Karolina Muchova in Tokyo has booked her spot in the semi-finals and given the Swiss player hope of a WTA title.
Bencic came from a set down to win 3-6, 7-5, 7-5, and she will face Sofia Kenin in tomorrow morning's semi-final.
11:37 CET - Qualifier and world number 305 Claire Liu has sealed a spot in the Guangzhou semi-finals after coming from behind to claim a shock 4-6, 6-0, 6-4 victory over Ella Seidel.
09:10 CET - Over in Guangzhou, qualifier Lulu Sun has stunned Caty McNally 3-6, 6-3, 6-4 to reach the semi-finals.
09:00 CET - Sofia Kenin becomes the third semi-finalist after coming through an epic battle against Ekaterina Alexandrova to win 6-0, 2-6, 7-6 (3) in Tokyo.
07:30 CET - Good morning and welcome back to quarter-final Friday! After Anna Kalinskaya's retirement earlier on after going a set down, in-form Linda Noskova booked the first semi-final spot in Tokyo. And number two seed Elena Rybakina avoided a potential upset against the exciting teenager to win 6-3, 7-6 (4) and become the second semi-finalist.