22:50 CET - Another talented young gun Alex Michelsen (20) has gained revenge over Cameron Norrie (29) after defeat to him last week in Dallas, beating the Brit 7-6(3), 7-5 in Delray Beach to make the semi-finals.
22:35 CET - Teenage wonderkid Joao Fonseca (18) has somehow snatched victory from the jaws of defeat in Buenos Aires. The Brazilian was 5-3, 40-15 down in the third set, but managed to mount a remarkable comeback against Mariano Navone (23), winning 3-6, 6-4, 7-5 in nearly three hours!
He is an ATP semi-finalist for the very first time.
22:32 CET - Hamad Medjedovic (21) has won an incredible match with Daniel Altmaier (26) in Marseille, beating his German opponent 7-5, 6-7(7), 6-4. The Serb squandered three match points in the second set, but still managed to claim the win in two hours and three quarters.
20:51 CET - Miomir Kecmanovic (25) is the first winner of the day in Delray Beach, sealing a comeback 2-6, 6-4, 6-2 victory over Marcos Giron (31) to secure a last-four spot.
19:28 CET - Daniil Medvedev's (29) quest to regain some momentum and win a title for the first time in over a year continues, as he defeats Jan-Lennard Struff (33) 6-3, 6-2 in Marseille to move into the last four.
19:19 CET - Laslo Djere (29) is the first semi-finalist in Buenos Aires, knocking out Thiago Seyboth Wild (24) 7-6(3), 6-4 in an hour and 40 minutes.
18:14 CET - Amanda Anisimova (23) is into the Doha final after a brilliant performance against Ekaterina Alexandrova (30), dismissing her Russian opponent 6-3, 6-3 in just over an hour and a half.
Prior to last August, Anisimova had never reached a WTA 1000 final. But in the span of six months, the American has recaptured her best form after taking a break from tennis in 2023 due to mental health concerns, and has now reached this stage for a second time.
After losing to Jessica Pegula in the Toronto showpiece, she will be hoping to go one step further this time around.
So the final is set: Jelena Ostapenko will take on Amanda Anisimova on Saturday, as both players hunt their first-ever WTA 1000 title.
17:32 CET - Over in Marseille, we will have at least one French semi-finalist as second seed and defending champion Ugo Humbert (26) has dispatched Lorenzo Sonego (29) 6-4, 6-4 to book his place in the weekend's action.
16:27 CET - Jelena Ostapenko (27) has continued her great form against Iga Swiatek (23) by knocking the second seed out of the Qatar Open and booking her spot in the final with a 6-1, 6-3 victory.
15:25 CET - Zizou Bergs (25) is into the Marseille semi-finals after his opponent, Zhizhen Zhang (28), had to retire from the match with an injury after losing the first set 7-5.
13:52 CET - Play will get underway in the Qatari capital in just over an hour, while the quarter-finals in Marseille begin at 14:30 CET.
Zhizhen Zhang (28) will be in action first, while defending champion Ugo Humbert (26) takes on Lorenzo Sonego (29) straight after.
Daniil Medvedev (29) then faces big serving Jan-Lennard Struff (34), before Hamad Medjedovic (21) rounds out the day.
Meanwhile, young superstar Joao Fonseca (18) will be looking to reach the semi-finals in Buenos Aires, and Alexander Zverev (27) will take to the clay courts of Argentina a little later this evening.
09:40 CET - Let's take a deeper dive into the two Doha semi-finals this afternoon where Iga Swiatek (23) takes on Jelena Ostapenko (27) whilst Ekaterina Alexandrova (30) meets Amanda Anisimova (23) for a place in the showpiece match on Saturday.
The first match sees Swiatek face up against Ostapenko, who is turning into a bit of a bogey opponent for her. The Latvian has won all four of their matches including at the US Open in 2023.
But, Swiatek's record in Doha is remarkable, winning her last 15 matches in the tournament. One of those records will be broken today from 15:00 CET.
That match will be followed by the clash between Alexandrova and Anisimova, and both players have a great chance of making a rare WTA Tour final.
For Anisimova, she has not won a title on tour since 2022, whilst Alexandrova's drought is shorter having won the title in Linz just a few weeks ago.
This, then, will make the Russian favourite, but they have won one each of their only two meetings, with, interestingly, the American Anisimova coming out on top at this tournament back in 2020.
09:00 CET - Good morning and welcome to what could be another tasty day of tennis as we are at the semi-final stage in Qatar, with the ATP Tour moving towards the finals over the weekend.
But, before then, let's bring you the results from overnight.
In Buenos Aires, third seed Lorenzo Musetti (22) is through to the quarter-finals later today as the Italian dispatched Corentin Moutet (25) 6-2, 6-3 in just 91 minutes.
Meanwhile, in Delray Beach, it was a mixed evening for the home favourites. Top seed Taylor Fritz (27) lived up to expectations with a 7-6(4), 6-2 victory over China's Yunchaokete Bu (23). However, it was not a night to remember for one of the stars of the Australian Open, Learner Tien (19), who was narrowly defeated 6-7(4), 6-4, 6-7(1) by Italy's fourth seed Matteo Arnaldi (23).