12:50 CET - A big moment for China's Shuai Zhang (35) who has finally ended her remarkable 24-match losing streak with a 7-6(5), 7-6(1) victory over McCartney Kessler (25).
Katie Volynets (22) and Clara Burel (23) have also progressed to the next round in Beijing.
11:43 CET - Roberto Bautista-Agut (36) was involved in a three-hour battle with Roman Safiullin (27), eventually coming out on top 7-5, 3-6, 6-4.
11:18 CET - Second seed Hubert Hurkacz (27) has battled through in Tokyo, outlasting Marcos Giron (31) 6-4, 6-7(5), 6-4 in just over two hours.
09:44 CET - Four-time Grand Slam champion Naomi Osaka (26) has won her opening match in Beijing, sweeping aside Italy's Lucia Bronzetti (25) 6-3, 6-2.
Taylor Townsend (28) is also through to the next round after a hard-fought 6-2, 4-6, 6-3 triumph against Martina Trevisan (30).
08:50 CET - Matteo Berrettini (28) is through in Tokyo after a fairly routine 6-3, 6-4 victory over qualifier Botic van de Zandschulp (28).
08:23 CET - There have been a couple of notable results overnight, with Sofia Kenin (25) beating Ana Bogdan (31) 7-5, 6-2 in Beijing and Mariano Navone (23) getting the better of Luciano Darderi (22) 6-4, 6-4 in Tokyo.
Check out the full WTA schedule in Beijing here and the ATP schedule in Tokyo here.
08:00 CET - Good morning and welcome to our coverage of today's tennis action!