23:48 CET - Petra Kvitova (33) has booked her spot in the final four with a tenacious win over Ekaterina Alexandrova (28). The Czech veteran won the first set 6-4 before Alexandrova levelled in the second, taking it 6-3. Undeterred, Kvitova roared back in the decider, winning it 6-3.
Here is the ATP Flashmoment of the day, courtesy of Daniil Medvedev and Chris Eubanks.
22:37 CET - Karen Kachanov (26) will face Medvedev in the semis in Miami, after seeing off Francisco Cerundolo (24) 6-3, 6-2.
21:24 CET - Chris Eubanks' (26) run in Miami is over at the hands of Daniil Medvedev (27) who won their quarter-final clash 6-3, 7-5. Medvedev will face either Karen Khachanov (26) or Francisco Cerundolo (24) in the final four.
9:04 CET - Canada's Bianca Andreescu (22) suffered two torn ligaments in her left ankle at the Miami Open this week and is unsure when she will be fit to return to action, the former US Open champion said on Wednesday.
World number 31 Andreescu retired from her fourth-round match against Russia's Ekaterina Alexandrova in Miami on Monday and left the court in a wheelchair after screaming in pain having fallen while moving across the baseline.
"It's tough to say exactly how long it will take, but let's just say it could've been much worse !!" Andreescu wrote on Twitter.
"I'm going to take it day by day, and I am optimistic that with the right work, rehab, and preparation, I'll be back on court soon."
Read full story here.
6:33 CET - Despite a delay due to the rain, Jannik Sinner managed to overcome Emil Ruusuvuori. The Italian prevailed with a comfortable 3-6, 1-6.
He is set to face the winner between Carlos Alcaraz and Taylor Fritz in the final four.
The quarter-finals continue in both ATP and WTA tours! Later today world number five Daniil Medvedev takes on Christopher Eubanks followed by Russian Karen Khachanov's clash with Argentine Franciso Cerundolo.
Meanwhile, Petra Kvitova takes to the court against Ekaterina Alexandrova for a place in the Miami Open semi-finals.
