13:24 CET - Marta Kostyuk has given Ukraine a 1-0 lead in their BJK Cup semi-final against Italy after seeing off Elisabetta Cocciaretto in straight sets, 6-2, 6-3.
Meanwhile, Brandon Nakashima and Arthur Cazaux have claimed victories in China.
11:55 CET - Play in Seoul has been called off for the day due to rain, and the quarter-finals and semi-finals will all be played tomorrow instead.
10:48 CET - Christopher O'Connell is the latest man through in Chengdu after a routine 6-2, 6-4 win over Yi Zhou, while Sebastian Korda has beaten Adam Walton 7-5, 6-3 in Hangzhou.
Elsewhere, rain continues to delay the start of play in Seoul, with Iga Swiatek's mouthwatering quarter-final clash against Barbora Krejcikova still scheduled to take place this morning.
08:56 CET - Alejandro Tabilo and Marcos Giron are through to the quarter-finals in Chengdu after straight-set wins over Luciano Darderi and Lorenzo Sonego, respectively.
Meanwhile, in Hangzhou, Aussie Rinky Hijikata has advanced after a hard-fought 7-6(2), 6-4 triumph against Camilo Ugo Carabelli.
07:30 CET - Good morning and welcome to our coverage of today's tennis!
It promises to be a jam-packed day of action, as defending champions Italy face Ukraine in the first BJK Cup semi-final, before the Laver Cup gets underway this evening with Casper Ruud taking on Reilly Opelka.
Meanwhile, in Asia, there are plenty of matches to look forward to at tournaments in Seoul, Chengdu and Hangzhou, including Iga Swiatek's blockbuster clash against Barbora Krejcikova.
Check out the full draw in Seoul, Chengdu and Hangzhou via the links.