20:25 CET - Great Britain have sealed their spot in the Billie Jean King Cup finals after doubles duo Jodie Burrage and Katie Boulter soared to a 6-2, 6-2 victory over the Netherlands' Demi Schuurs and Suzaa Lamens.
19:23 CET - Elina Svitolina has sent Ukraine through to the BJK Cup finals, beating Switzerland's Jil Teichmann 6-4, 6-2.
The Netherlands have also stayed alive thanks to Suzan Lamens' 6-4, 6-3 win over Katie Boulter, but the Czech Republic and Denmark are both out with Linda Nozkova losing to Jessica Bouzas Maneiro of Spain and Johanne Christine Svendsen being beaten by America's Bernarda Pera.
18:22 CET - Lorenzo Musetti has edged a thriller against Alex De Minaur to book his place in the Monte Carlo final, where he will meet Carlos Alcaraz tomorrow.
After a deciding set tie-break and a match which ebbed and flowed, Musetti got over the line to win 1-6, 6-4, 7-6 (7-4).
Musetti's level has been high all week and was impressive again today as he produced some brilliant winners to set up an intriguing final.
17:17 CET - Switzerland have taken a shock 1-0 lead against Ukraine, with 19-year-old Celine Naef stunning world No. 25 Marta Kostyuk, 6-4, 7-6(1).
Meanwhile, Spain also got off to a good start in their tie with Czechia after Cristina Bucsa beat Marie Bouzkova, 7-5, 6-1.
17:12 CET - Lorenzo Musetti has fought back in Monte Carlo, taking the second set 6-4 against Alex De Minaur. A final set will decide who is heading to their first-ever Masters 1000 final.
16:40 CET - Great Britain are off to a winning start in their BJK qualifier against the Netherlands after Sonay Kartal beat Eva Vedder 6-4, 4-6, 6-1.
USA are also off to a winning start as Hailey Baptiste wasted no time in beating Denmark's Rebecca Mortensen 6-1, 6-4.
16:25 CET - Alex De Minaur has picked up where he left off in his double-bagelling demolition of Grigor Dimitrov, claiming the first set against Lorenzo Musetti 6-1. The Aussie is in seriously good form right now.
15:23 CET - Carlos Alcaraz is a Monte Carlo finalist! The Spaniard was made to work hard by his fellow countryman Alejandro Davidovich Fokina, as the pair battled for over two hours. But in the end, the four-time Grand Slam champion was too strong as he clinched a 7-6(2), 6-4 win.
He will face either Alex De Minaur or Lorenzo Musetti in the final, where he will have a chance to win his first Monte Carlo crown and also move up to No. 2 in the world rankings.
You can follow the second semi-final live here.
14:16 CET - Carlos Alcaraz made it really tricky for himself with some really up-and-down tennis, but the world No. 3 eventually clinched the first set against Alejandro Davidovich Fokina, 7-6(2). Alcaraz led 5-2 in the set, but his opponent battled back to take it to a tiebreak.
10:40 CET - Japan have kept their hopes of BJK Cup progression alive with Moyuka Uchijima beating Anca Alexia Todoni 3-6, 7-6, 6-2 in a gruelling battle to give her nation a win over Romania.
Romania are now out, and Japan will face Canada in a winner-takes-all decider.
08:49 CET - The first Billie Jean King Cup tie of the day has been won by Australia, who have beaten Colombia 3-0 thanks to victories for Maya Joint and Kimberly Birrell and a dominant display in the dead-rubber doubles match.
It's a win that doesn't mean much with Kazakhstan already securing top spot in the group, but the Aussies will be glad to end their campaign on a high.
08:45 CET - Hello and welcome to Flashscore's coverage of today's tennis!
The main event this weekend is, of course, the conclusion to the Monte-Carlo Masters, with the semi-finals taking place this afternoon.
At 13:00 CET, Carlos Alcaraz will take on compatriot Alejandro Davidovich Fokina, and that will be followed by a clash between Alex De Minaur and Lorenzo Musetti.
On the women's side of the game meanwhile, some big names will take to the court throughout the day in Billie Jean King Cup qualifiers.