23:30 CET - That's all from us today on the Tennis Tracker but be sure to follow the overnight action in Buenos Aires here and Delray Beach here.
23:20 CET - In the last match of the day in Marseille, China's Zhang Zhizhen (28) has beaten local hope Quentin Halys (28) 6-3, 6-7, 7-6 in an epic to move into the second round.
Catch up on all the results from Marseille here.
21:32 CET - We have another big-name casualty in Doha! This tournament is now wide open as Australian Open semi-finalist and ninth seed Paula Badosa (27) has lost in straight sets 6-4, 6-3 against USA's Amanda Anisimova (23) in the third major shock of the day.
That was also the final match of the day in Qatar - you can catch up on all the results from Doha here.
20:55 CET - Stan Wawrinka (39) has lost at the first hurdle in Marseille after coming up just short against Nuno Borges (27) who won 6-7 (4-7), 7-6 (7-1), 6-3 to advance.
20:10 CET - In the penultimate match of the day in Doha, Magda Linette (32) has edged out fellow Pole Magdalena Frech (27) 7-5, 5-7, 6-4 to book a spot in the third round.
The final third-round berth will be filled by the winner of Paula Badosa (27) and Amanda Anisimova (23).
19:37 CET - We have another upset and it's the biggest one yet! World number one Aryna Sabalenka (26) has been knocked out in Doha, losing 3-6, 6-3, 7-6 to Ekaterina Alexandrova (30).
One of the seeds still standing is Daria Kasatkina (27), who has beaten Elina Avanesyan (22) 6-2. 6-3 to advance to the next round.
18:36 CET - Yoshihito Nishioka (29) is through at Delray Beach thanks to a 6-3, 6-4 win over Aleksandar Vukic (28).
In Marseille meanwhile, Luca van Asshe (20) and Jan-Lennard Struff (34) have both made it through.
17:15 CET - Sixth seed Jessica Pegula (30) is also through to the third round in Doha after negotiating her tie with Elina Svitolina (30), winning 6-3, 7-6.
16:45 CET - Ons Jabeur (30) is through to the third round in Doha after downing seventh seed Zheng Qinwen (22) 6-4, 6-2. For Jabeur, the win is her first over a top-10 opponent on hard court since 2023!
Over in Marseille, Alexander Bublik (27) is through to the second round after beating veteran Richard Gasquet (38) 6-4, 6-4.
14:51 CET - Fifth seed Elena Rybakina (25) has successfully reached the third round in Doha after cruising past Peyton Stearns (23) 6-2, 6-4.
In the first big shock of the day, third seed Coco Gauff (20) has been dumped out, however, losing 6-2, 7-5 to Marta Kostyuk (22) in their second-round meeting!
14:35 CET - The day's play is underway in Marseille with Daniel Altmaier (26) easing past Luca Nardi (21) 6-2, 6-2 to move into the second round.
14:30 CET - A couple more winners to report from Doha, Sofia Kenin (26) has advanced after downing fellow American Alycia Parks (24) 7-6, 3-6, 6-2.
Belgium's Elsie Mertens (29) is also through to the third round after beating Cristina Busca (27) 6-2, 6-3.
13:41 CET - Jasmine Paolini (28) has eased through in Qatar with a 6-3, 6-4 win over Caroline Garcia (31), while Linda Noskova (20) has claimed a 6-2, 6-3 victory over world number 20 Yulia Putinsteva (30).
11:15 CET - The fun in Doha will begin in 45 minutes with a clash between world number four Jasmine Paolini (28) and Caroline Garcia (31).
Coco Gauff (20) and Elena Rybakina (25) will begin their tournaments shortly after that before Aryna Sabalenka (26) takes to the court this evening.
Check out the full schedule here.
08:30 CET - Hello and welcome to Flashscore's coverage of today's tennis!
Before we turn our attention to the main event, the Qatar Open, there is some overnight action to catch you up on. At Delray Beach, sixth seed Brandon Nakashima (23) beat JK Trotter (25) 7-6, 6-1, while Laslo Djere (29) beat Alexandre Muller (28) 6-3, 6-3 in Buenos Aires.
Catch up on all of the results from Delray Beach here and Buenos Aires here.