Tennis Tracker: Alcaraz stunned by Machac in Shanghai after Nadal announces retirement
17:15 CET - The final woman through to the quarter-finals in Wuhan is Magdalena Frech (26), with the Pole seeing off ninth seed Beatriz Haddad Maia (28) 6-3, 6-2.
And that's all from today's Tennis Tracker! Tune back in tomorrow for all the latest news and results from China.
15:28 CET - Top seed Aryna Sabalenka (26) overcame a shaky start to battle past the tricky Yulia Putintseva (29) 1-6, 6-4, 6-0 in just over two hours.
The Belarusian remains undefeated in Wuhan with an impressive 14-0 record.
14:44 CET - Carlos Alcaraz (21) has fallen at the quarter-final stage in Shanghai, with Tomas Machac (23) securing a shock 7-6(5), 7-5 victory over the third-seeded Spaniard.
It's a first defeat for Alcaraz since his second-round exit at the US Open in August.
12:06 CET - Fifth seed and home favourite Qinwen Zheng (22) recovered from a set down to outlast Leylah Fernandez (22) 5-7, 6-3, 6-0 and seal her place in the Wuhan quarter-finals.
11:50 CET - Some huge breaking news away from the action in China, with 22-time major champion Rafael Nadal (38) announcing his retirement from the sport. The Spaniard's last tournament will be the Davis Cup finals in November.
10:54 CET - World number one Jannik Sinner (23) produced a superb display to ease past Daniil Medvedev (28) 6-1, 6-4 and book his spot in the Shanghai semi-finals.
Third seed Jasmine Paolini (28) was in equally impressive form in Wuhan, sweeping aside Erika Andreeva (20) 6-3, 6-2 to continue her remarkable season.
09:37 CET - Second seed Jessica Pegula (30) has been dumped out by Xinyu Wang (23) in Wuhan, with the home favourite securing an impressive 6-3, 7-5 triumph.
Meanwhile, Magda Linette (32) and Ekaterina Alexandrova (29) have booked their spots in the quarter-finals after straight-set wins over Daria Kasatkina (27) and Hailey Baptiste (22) respectively.
07:30 CET - Good morning and welcome back to the Tennis Tracker! It is a stellar day of action in China, with the first two men's quarter-finals set to take place in Shanghai. At 09:00 CET, world No.1 Jannik Sinner (23) takes on Daniil Medvedev (28), before Carlos Alcaraz (21) faces Tomas Machac (23).
Meanwhile, the last 16 is already underway in Wuhan, with Coco Gauff (20) continuing her impressive form, sweeping aside Marta Kostyuk (22) 6-4, 6-1 for an eighth consecutive victory.
Aryna Sabalenka (26), Jessica Pegula (30) and Qinwen Zheng (22) are also all in action today.