22:29 CET - Our fourth champion of the day has been crowned, this time in Charleston, where Ons Jabeur (28) has seen off Belinda Bencic (26) in straight sets 7-6, 6-4 in two hours and one minute.
22:16 CET - Frances Tiafoe now knows who he will face in the final in Houston after Tomas Martin Etcheverry (23) beat Yannick Hanfmann (31) 6-3, 6-4.
21:20 CET - Tatjana Maria (35) is the champion in Bogota. The German outlasted Peyton Stearns (21) in three sets 6-3, 2-6, 6-4 in just over two hours.
Elsewhere, Frances Tiafoe (25) continues his run in Houston with a 6-4, 6-1 victory over Gijs Brouwer (27).
20:44 CET - World number 12 Hubert Hurkacz (26) has rounded off play in Monte Carlo with a victory over Laslo Djere (27) 6-7, 7-6, 7-6 - all three sets going to tie-breaks.
20:35 CET - Play is winding down on the first day of the main draw in Monte Carlo with Jaume Munar (25) has advanced into the next round with a battling 7-6, 4-6, 6-4 win over Marc-Andrea Huesler (26).
Whilst we are waiting for more results, here it today's WTA Flashmoment of the day.
19:37 CET - Roberto Carballes Baena (30) has won the title in Marrakech after beating Alexandre Muller (26) 6-4, 6-7, 6-2 in the final over the course of nearly three hours. Check out our ATP Flashmoment of the day, which came from this game.
19:08 CET - Check out what Ruud had to say following his victory below.
18:36 CET - And we have our first champion of the day! Casper Ruud is victorious in Estoril, defeating Miomir Kecmanovic 6-2 7-6(3). His clay court season is off to the perfect start.
17:10 CET - One of the most glamorous tournaments on the calendar is under way in Monte Carlo and we have our first result from the clay in the principality. Nicolas Jarry (27) has beaten Croatian Borna Coric (26) in straight sets, 6-2, 6-3.
8:16 CET - It is set to be a really busy day. Alongside the early rounds of Monte Carlo and final stages of Charleston, Casper Ruud (24) takes on Miomir Kecmanovic (23) in the Estoril final at 15:30 CET.
Roberto Carballes Baena (30) faces Alexandre Muller (26) in the final of Marrakech at 16:00 CET, while we have semi-final and final action in Houston, which includes Frances Tiafoe (25).
8:12 CET - Action from the Monte Carlo Masters begins today, with Hubert Hurkacz (26) set to take to the court at 15:30 CET. Reigning champion Stefanos Tsitsipas (24) spoke of his excitement about returning to the clay, and the complexities of the surface.
Read about that here.
8:03 CET - The rain caused havoc in Charleston yesterday, but Ons Jabeur (28) managed to complete her game and defeat Daria Kasatkina (25) 7-5 7-5. Her fellow finalist is not yet known though, as Belinda Bencic (26) and Jessica Pegula (29) were locked in a thrilling battle before the rain forced them off. Bencic had won the first set 7-5, but the match was postponed while the pair were in a second set tiebreak, with Pegula leading 4-2. The match will resume today, with the final following afterwards.
You can read more about the Charleston semi-finals here.