23:27 CET - Madison Keys (28) is out in Charleston after losing in three sets to Daria Kasatkina (25). Despite winning the first set, the American succumbed to 6-7, 6-4, 6-2 defeat.
22:19 CET - With rain around in Charleston and Bogota, we are having some delays on the courts, but a marathon match in Marrakech has come to a dramatic conclusion with a third-set tie-break.
After winning the first 6-3, Pavel Kotov (24) was then pegged back by Christopher O'Connell (28) in a tie-break before Kotov prevailed in two hours and 49 minutes.
While we are waiting for more results, here are today's Flashmoments of the day.
21:29 CET - A comfortable route through to the semis for Casper Ruud (24) with a 6-3, 6-0 victory over Sebastian Baez (22) in Estoril - check out the highlights now.
21:09 CET - Two results from Bogota where the surprise package of the week - based on rankings - Francesca Jones (22), the world number 817 has beaten Laura Pigossi (28) 6-4, 6-2. Elsewhere, Tatjana Maria (35) has seen off Nuria Brancaccio (22) 6-3, 6-2.
20:46 CET - Play is happening across all four WTA and ATP tournaments, including Charleston, where Ons Jabeur has made light work of Anna Kalinskaya (24). The Tunisian world number five was 6-0, 4-1 up before Kalinskaya was forced to retire.
19:46 CET - Dominic Thiem (29) is out in Estoril having been beaten Quentin Halys (26) 6-1, 6-4.
19:08 CET - Back in Marrakech, Alexandre Muller (26) has progressed into the weekend's semi-finals with a three-set win over Lorenzo Musetti (21). The Frenchman won the first set 6-3 before Musetti battled back to win the second 6-1. The decider was a tight affair, but it was Muller who prevailed to win it 6-4.
17:44 CET - In Estoril, Bernabe Zapata Miralles (26) has been defeated by Serbian Miomir Kecmanovic (23) 7-5, 6-2, which sees the world number 40 set for a match against Marco Cecchinato (30) on Saturday for a place in the final.
Elswhere, Roberto Carballes Baena (30) has seen off the challenge of Tallon Griekspoor (26) 6-3, 2-6, 6-2 to advance into the final four in Marrakech.
15:20 CET - We have our first set of results from Estoril and Marrakech. Marco Cecchinato (30) is through to the semi-finals in Portugal with a 7-5, 7-6 victory over Spaniard Alejandro Davidovich Fokina (23), whilst in Morocco, Dan Evans (32) has seen off Andrea Vavassori (27) 6-3, 7-5 to go into the final four.
6:30 CET - We begin the day with some overnight action as Madison Keys got past Magda Linette in Charleston to reach the quarter-finals of the tournament. The American's next opponent is Daria Kasatkina.
And it continues! Later today, Ons Jabeur will look to book a place in the semi-finals as she faces Anna Kalinskaya.
Meanwhile, on the men's end, things are getting even more exciting in Estoril as Casper Ruud takes on Sebastian Baez to reach the final four of the tournament. They follow Dominic Thiem's clash with Frenchman Quentin Halys.
Frances Tiafoe and Tommy Paul are playing their matches later today as well in Houston, stay tuned as we bring you the latest from Marrakech, Houston and the tennis world today!