23:52 CET - Spain's Alejandro Davidovich Fokina (23) has set up a quarter-final meeting with Marco Cecchinato (30) in Estoril after beating Luca van Assche (18) 6-3, 7-5.
22:22 CET - Jessica Pegula (29) has also progressed to the third round in Charleston by beating Anna Blinkova (24) 6-2, 6-0.
See all the results from Charleston here.
20:48 CET - After dropping the first set, Norway's Casper Ruud (24) has beaten Portuguese player Joao Sousa (34) in Estoril. The match finished 4-6, 6-2, 6-2.
20:18 CET - Our FlashMoment of the day from the men's circuit comes courtesy of Casper Ruud (24) in his match with Joao Sousa (34). Take a look at this great rally and the exquisite lob to finish it!
19:39 CET - Our WTA FlashMoment of the day is a brilliant rally between Linda Fruhvirtova (17) and Caroline Dolehide (24). Check it out below.
19:38 CET - See what the Spaniard had to say after the match.
19:05 CET - Paula Badosa (25) has edged past Leylah Fernandez (20) in two tight sets, 7-5 7-6(6), to reach the next round in Charleston.
18:00 CET - In an all-Argentine duel in Estroil, Sebastian Baez (22) has beaten Pedro Cachin (27) 6-4, 7-6(2). Take a look at the highlights from that match below.
Norwegian Casper Ruud (24) is about to take the court for his second-round match.
15:05 CET - Play is underway at some of the headline tournaments of the week. Stay tuned with us here on the Tennis Tracker for updates and some highlights from ATP tournaments in Estoril, Houston and Marrakech and WTA events in Bogota and Charleston.
11:28 CET - Ons Jabeur (28) and Victoria Azarenka (33) both recorded wins in Charleston overnight, have a listen to their post-match comments below.
7:58 CET - With Rafael Nadal's (36) injury problems ruling him out of Monte Carlo, it's beginning to look like the Spaniard may not be the force he once was on clay. Check out our feature article on who may be the man to step up and become the new King of Clay.
7:44 CET - Let's start today off with some results overnight. In Houston, Jack Sock (30) was beaten by Tomas Machac (22) 6-2 6-4.
In Charleston, Victoria Azarenka (33) overcame Sloane Stephens (30) 3-6 6-3 6-3, while Ons Jabeur (28) cruised past Lesia Tsurenko (33) 6-3 6-3.
Stay tuned during the rest of the day as Paula Badosa (25) takes on Leylah Fernandez (20) in the U.S., and Casper Ruud (24) begins his clay court campaign in Estoril against Joao Sousa (34).