23:49 CET - Lorenzo Sonego (29) is through to the final in Winston-Salem with a 6-3, 6-2 victory over David Goffin (33).
18:56 CET - We're still a few hours away from action getting underway but here's what you can look forward to later this evening.
First up at 22:00 CET is the opening semi-final in Winston-Salem between David Goffin (33) and Lorenzo Sonego (29).
Following the conclusion of that match, American teenager Alex Michelsen (19) comes up against Pablo Carreno-Busta (33) in the other semi-final, while in Cleveland, McCartney Kessler (25) and Anastasia Potapova (23) kick proceedings off at 23:30 CET.
Emma Navarro (23), Beatriz Haddad Maia (28) and Linda Noskova (19) are then all in action during the early hours of Saturday morning.
10:08 CET - At this week's solitary ATP event in Winston-Salem, there were overnight wins for Pablo Carreno-Busta (33), Alex Michelsen (19) and David Goffin (33) who all progressed to the semi-finals.
Check out the full draw here.
09:05 CET - There were plenty of notable results overnight, with second seed Emma Navarro (23) progressing in Monterrey after a 6-7(3), 6-0, 6-2 victory over Magdalena Frech (26). The American will face Linda Noskova (19) in the last four after the Czech teenager impressively swept aside Elina Svitolina (29) 6-4, 6-4.
Meanwhile, in Cleveland, Katerina Siniakova (28) recovered from a set down to book her spot in the semi-finals, triumphing 1-6, 6-3, 6-4 against home favourite Peyton Stearns (22).
Check out the full Monterrey schedule here and the Cleveland schedule here.
08:30 CET - Good morning and welcome to our coverage of today's tennis action!