22:19 CET - In the final tournament of his professional career, Diego Schwartzman (32) has beaten Nicolas Jarry (29) in a three-hour first-round thriller, 7-6(10), 4-6, 6-3.
21:31 CET - Defending champion Ugo Humbert (26) has got his Marseille campaign off to a fine start, battling past Alexander Bublik (27) 7-6(7), 6-4.
20:23 CET - Amanda Anisimova (23) was in supreme touch as she dismantled Leylah Fernandez (22) 6-3, 6-0 in just over an hour to move swiftly into the Doha quarter-finals.
19:40 CET - Over in Marseille, there has been a shock result as Hamad Medjedovic (21) has just beaten third seed Karen Khachanov (28) 6-2, 6-3 in an impressive display.
19:04 CET - Ons Jabeur (30) has made light work of Sofia Kenin (26) in Doha, dispatching the former Grand Slam champion 6-3, 6-4.
Meanwhile, teen sensation Joao Fonseca (18) has progressed in Buenos Aires, easing past No. 8 seed Tomas Martin Etcheverry (25) 6-3, 6-3.
Another young star who impressed at the Australian Open, Learner Tien (19), also clinched a victory in Delray Beach after beating Adam Walton (25) 6-4, 6-3.
18:26 CET - Daniel Altmaier (26) is the latest man through in Marseille after a relatively routine 6-4, 6-3 triumph over Otto Virtanen (23).
17:45 CET - Iga Swiatek (23) has avoided becoming the latest top seed to fall in Doha, with the Pole recovering from a set down to outlast Linda Noskova (20) 6-7(1), 6-4, 6-4 in just over two-and-a-half hours.
16:58 CET - Fresh from winning the title in Linz earlier this month, Ekaterina Alexandrova (30) is safely through to the quarter-finals in Qatar, easing past Elise Mertens (29) 6-4, 6-2 in just 72 minutes.
16:53 CET - Marta Kostyuk (22) has continued her impressive form in Doha, sweeping aside Magda Linette (33) in straight sets, 6-4, 6-2.
Meanwhile, in Marseille, seventh seed Lorenzo Sonego (29) is through to the last eight after his opponent Luca van Assche (20) withdrew from their second-round clash.
15:35 CET - While many a top seed has gone tumbling out of Doha, there has been no such problem for American Jessica Pegula (30), who progressed into the quarter-finals with a 6-3, 7-5 victory over Daria Kasatkina (27).
14:49 CET - Jelena Ostapenko (27), who hasn't been in the best form in singles, has produced an incredible performance to crush Jasmine Paolini (29) 6-2, 6-2. An impressive win for the Latvian.
13:43 CET - Elena Rybakina (25) has sealed her spot in the Doha quarter-finals after battling through a tough opening set to defeat Rebecca Sramkova (28) 7-6(1), 6-2.
10:47 CET - We're just over an hour away from play starting in Doha, as fifth seed Elena Rybakina (25) takes on Rebecca Sramkova (28) at 12:00 CET.
Later on, world number two Iga Swiatek (23) comes up against Linda Noskova (20), while Jessica Pegula (30), Jasmine Paolini (29) and Ons Jabeur (30) are all in action.
Follow the full draw in Doha here.
08:52 CET - There were some notable results overnight in Delray Beach, with wildcard Reilly Opelka (27) downing compatriot Christopher Eubanks (28) 6-3, 7-6(7) and Mackenzie McDonald (29) battling past Kei Nishikori (35) 7-6(4), 4-6, 7-5 in a three-set epic.
Check out the full schedule in Delray Beach here.
08:40 CET - Good morning and welcome to our coverage of today's tennis!
