23:57 CET - Whilst our coverage is ending for the night, there is plenty more action to enjoy over the next few hours in Rio including exciting talent Joao Fonseca (18) in his home tournament just a few days after his maiden ATP tour title in Buenos Aires.
Follow all the overnight action in Rio with Flashscore's live updates.
23:07 CET - Two Argentine victories in Rio to bring you, where Sebastian Baez (24) has beaten lucky loser Roman Andres Burruchaga (23) 6-3, 7-5 and eighth seed Tomas Martin Etcheverry (25) has defeated Corentin Moutet (25) 6-3, 7-6(1).
22:13 CET - It's another fruitless tournament for Stefanos Tsitsipas (26), who has fallen at the first hurdle in Doha, losing to Hamad Medjedovic (21) 7-6(6), 5-7, 7-6(5).
Meanwhile, in Rio, there have been wins for Damir Dzumhur (32) and Luciano Darderi (23).
21:37 CET - Clara Tauson (22) has seen off Elina Svitolina (30) in a three-set thriller that lasted two hours and 43 minutes. Svitolina saved four match points during the third-set tie-break, but she succumbed to a 7-6(5), 3-6, 7-6(4).
21:00 CET - Meanwhile, Emma Raducanu's (22) horrid run of defeats has continued as she loses in the Dubai first round to Karolina Muchova (28). The Czech star faced a tough challenge from Raducanu but came out on top in both sets to win 7-6 (8-6), 6-4.
20:56 CET - Some normality has returned as world number one Aryna Sabalenka (26) has safely secured a place in the next round in Dubai by beating Veronika Kudermetova (27) 6-3, 6-4.
19:42 CET - The next big-name exit this evening comes from third seed Coco Gauff (20) losing in straight sets to fellow American McCartney Kessler (25) who won 6-4, 7-5.
19:16 CET - Novak Djokovic's (37) time in Doha has come to a swift end after losing his opening match against Matteo Berrettini (28) in straight sets! It is the first major shock of the week and a big one as the Australian Open semi-finalist and third seed goes crashing out to someone he had never lost to before today.
Berettini's powerful serve was a weapon throughout and Djokovic was well off the pace on his own serve, resulting in the Italian winning 7-6 (7-4), 6-2.
18:36 CET - Over in Doha, Felix Auger-Aliassime (23) has come from a set down to beat Quentin Halys (28) after a hard-fought deciding set tie-break 4-6, 6-4, 7-6 (7-2).
Felix suffered a setback in Rotterdam retiring from his first match of the tournament but his confidence should still be high having won the ATP event in Marseille earlier this month.
18:20 CET - Over to Dubai and the world number two Iga Swiatek (23) has made no mistake progressing after cruising to a 6-0, 6-2 win over former world number one Victoria Azarenka (35).
17:14 CET - Daniil Medvedev (29) - the fourth seed in Doha - has seen off world number 21 Karen Khachanov (28), but not after a two-and-a-half-hour battle. He won the game 4-6, 7-5, 6-3 to advance into the next round.
16:40 CET - The rain has ceased in Dubai and play is back underway with Iga Swiatek (23) on court, but we have a result from Dubai where Tallon Griekspoor (28) has dispatched Jan-Lennard Struff (34) in a tight one 7-6(5), 7-6(7).
16:08 CET - Doha's fifth seed Andrey Rublev (27) is through to the next round after defeating Alexander Bublik (27) in straight sets 6-3, 6-4.
Meanwhile, in a surprisingly rainy Dubai, Jasmine Paolini (29) has managed to dodge the showers and win the one point she needed to beat Eva Lys (23) 6-2, 7-5.
14:22 CET - Second seed Alex de Minaur (26) has progressed in Doha, with the Aussie seeing off the challenge of Roman Safiullin (27) in straight sets, 6-1, 7-5.
Nuno Borges (27) and Luca Nardi (21) are also through to the next round after convincing victories over Otto Virtanen (23) and Zhizhen Zhang (28) respectively.
11:25 CET - Talented Czech Linda Noskova (20) is through to the last 16 in Dubai after battling past Diana Shnaider (20) in a three-set thriller, 7-6(8), 4-6, 6-3.
10:57 CET - Rain has temporarily halted play at the WTA 1000 event in Dubai, with Jasmine Paolini (29) one game away from victory against Eva Lys (23) and fifth seed Jessica Pegula (30) taking on Luidmila Samsonova (26).
09:38 CET - Sixth seed Elena Rybakina (25) has eased through in Dubai, sweeping aside Moyuka Uchijima (23) 6-3, 6-2 in just 66 minutes.
It was an equally comfortable morning for the resurgent Paula Badosa (27), who made light work of Elise Mertens (29), winning 6-2, 6-1.
09:15 CET - There were a couple of notable results overnight in Rio as qualifier Chun Hsin Tseng (23) stunned third seed Alejandro Tabilo (27) 6-2, 7-5 and Jaume Munar (27) saw off home favourite Thiago Seyboth Wild (24) 6-4, 3-6, 6-0.
Catch up on all the results here.
08:34 CET - Play is already underway in Dubai this morning, with defending champion Jasmine Paolini (29), Elena Rybakina (25) and Paula Badosa (27) all in early action.
It's a blockbuster day at the WTA 1000 event as the world's top three players - Aryna Sabalenka (26), Iga Swiatek (23) and Coco Gauff (20) - all take to the court a little later on.
Check out the full schedule in Dubai here.
08:20 CET - Good morning and welcome to our coverage of today's tennis!
