00:04 CET - Nicolas Jarry (29) - the sixth seed in Rio - needed to come from a set down against Juan Manuel Cerundolo (23) to advance, winning the contest 4-6, 6-3, 6-4.
Still plenty of action to come from the Brazilian tournament tonight - follow it all here.
22:06 CET - Over to Rio, where Brazilian wildcard Felipe Meligeni Alves (26) has fallen to Alexander Shevchenko (24) 6-4, 6-2.
20:04 CET - Jack Draper (23) is through to the next round in Doha after a straight-set victory over Alexei Popyrin (25) 6-4, 7-6(4).
19:17 CET - In today's final match in Dubai, Mirra Andreeva (17) was in truly devastating form, sweeping aside Elina Avenesyan (22) 6-2, 6-1 in just 62 minutes.
18:26 CET - Top seed Carlos Alcaraz (21) survived a stern test from experienced Croat Marin Cilic (36) in Doha, with the Spaniard progressing to the next round via a 6-4, 6-4 victory.
17:47 CET - Peyton Stearns (23) has progressed in Dubai, with the American battling past Ons Jabeur (30) in two competitive sets, 7-6(6), 6-4.
17:08 CET - Hungary's Fabian Marozsan (25) is through in Doha after a convincing 7-5, 6-3 triumph over wildcard Aziz Dougaz (27).
Meanwhile, at the WTA event in Dubai, Veronika Kudermetova (27) recovered from a set down to defeat the in-form Ekaterina Alexandrova (30) 3-6, 6-4, 6-3.
16:22 CET - Jiri Lehecka (23) looked in good form in Doha as he eased past Grigor Dimitrov (33) 6-4, 6-4 to move into the second round. The latter was making his first appearance after retiring in the first round at the Australian Open.
Up next in Qatar is a clash of Grand Slam champions as Carlos Alcaraz (21) takes on veteran Marin Cilic (36).
You can follow that live here.
15:27 CET - Fernando Verdasco (41), who is set to retire from tennis this week in Doha, has won his opening-round doubles match with Novak Djokovic (37), beating Karen Khachanov (28) and Alexander Bublik (27) 6-1, 6-1.
14:50 CET - Christopher O'Connell (30) is the first player to win in Doha, battling past Lebanese player Hady Habib (26) in two really hard-fought sets, 7-6(7), 7-6(3).
14:15 CET - After winning her maiden WTA 1000 title in Doha on Saturday, Amanda Anisimova (23) has joined runner-up Jelena Ostapenko (27) in being dumped out of Dubai, after falling 2-6, 3-6 to fellow American McCartney Kessler (25). Clearly, their efforts last week have taken it out of them.
Veteran Victoria Azarenka (35) has survived a pure slugfest against Anhelina Kalinina (28), beating the Ukrainian 2-6, 7-6(4), 6-4 in nearly three hours.
12:54 CET - After an impressive run to the final in Doha last week, Jelena Ostapenko (27) has been sent packing in the opening round in Dubai, losing 3-6, 3-6 to Moyuka Uchijima (23).
Meanwhile, Clara Tauson (22) is safely through after battling through a tough opening set to defeat Rebecca Sramkova (28) 7-6(7), 6-0.
11:02 CET - Marta Kostyuk (22) has moved into the next round in Dubai after a relatively straightforward 6-3, 6-4 victory over Katerina Siniakova (28).
Meanwhile, No. 10 seed Daria Kasatkina (27) has been dumped out after an error-strewn performance, falling 1-6, 4-6 at the hands of Sorana Cirstea (34).
10:48 CET - Eva Lys (23), the lucky loser who made waves at the Australian Open, has won an opening-round thriller against Irina-Camelia Begu (34), defeating the Romanian 5-7, 7-5, 6-3 in two hours and a half to set up a meeting with Jasmine Paolini (29).
10:40 CET - A stellar ATP 500 event in Doha gets underway today, which sees the likes of Carlos Alcaraz (21), Novak Djokovic (37), Daniil Medvedev (29) and Alex de Minaur (26) set to battle it out for the title.
In action a little later today is Alcaraz, who takes on Marin Cilic (36), while Jack Draper (23) looks to get off to a good start against Alexei Popyrin (25).
09:46 CET - Diana Shnaider (20) has eased through to the next round in Dubai after a routine 6-2, 6-2 triumph over Magdalena Frech (27).
It was a contrasting tale for 12th seed Beatriz Haddad Maia (28), however, as the Brazilian fell to a desperately disappointing 3-6, 0-6 defeat to Anastasia Potapova (23).
08:52 CET - Play is already underway at the WTA 1000 event in Dubai, with Diana Shnaider (20) and Beatriz Haddad Maia (28) among those in early action.
There are several big names taking to the court a little later including Jelena Ostapenko (27), Daria Kasatkina (27), Mirra Andreeva (17) and Ons Jabeur (30).
Check out the full schedule in Dubai here.
08:30 CET - Good morning and welcome to our coverage of today's tennis!