23:33 CET - That is where we leave you for today, but be sure to come back tomorrow morning for second week action from Madrid.
23:28 CET - Finally today, Ekaterina Alexandrova has made no mistake in dispatching Daria Kasatkina, winning 6-3, 7-6 (7-3) to shock the 14th seed.
23:15 CET - Casper Ruud is the last man to book a place in the second week of Madrid with a comfortable 6-3, 6-3 win against Sebastian Korda.
21:52 CET - Over to the WTA side, and 17th seed Elina Svitolina has won comfortably to knock out 10th seed Elena Rybakina with an impressive 6-3, 6-4 win.
21:30 CET - Another dominant display in Madrid, this time from Francisco Cerundolo, has knocked out fellow Argentine Francisco Comesana 6-4, 6-4.
21:00 CET - One of the hot prospects of men's tennis, Jakub Mensik, has just knocked out world number 13 Ben Shelton in a dominant 6-1, 6-4 win in Madrid.
19:13 CET - Taylor Fritz is through to the next round in Madrid through fortuitous circumstances after Benjamin Bonzi was forced to retire with the match level at one set each.
18:15 CET - Back to the men's side and Daniil Medvedev has booked his spot in the second week with a dominant 6-2, 6-2 win against Juan Cerundolo.
17:23 CET - Peyton Stearns has won in straight sets in dominant fashion to knock out Rebeka Masarova 6-2, 6-0 in Madrid.
16:17 CET - World number two Alexander Zverev has avoided a shock upset at the hands of the in-form home player Alejandro Fokina, by edging a tight encounter 2-6, 7-6 (7-3), 7-6 (7-0).
16:10 CET - Another upset on this Sunday in Madrid as one of the favourites to win the tournament, Jessica Pegula, has been knocked out in straight sets by Moyuka Uchijima, who won 6-3, 6-2 to stun the third seed.
15:42 CET - Anastasia Potapova has come from a set down to battle to a big 3-6, 6-4, 7-6 (8-6) victory against Sofia Kenin to book her place in the second week at Madrid.
14:43 CET - A heavyweight clash between Maria Sakkari and world number six Jasmine Paolini has been won by the former, who has comfortably prevailed 6-2, 6-1.
That's a big win for the Greek player as she looks to climb her way back up the rankings.
13:44 CET - Marta Kostyuk is the second winner on the women's side in Madrid today. She's beaten Veronika Kudermetova 6-0, 4-6, 6-4 to move into the fourth round.
13:09 CET - Women's top seed and world number one Aryna Sabalenka has come back to beat Elise Mertens 3-6, 6-2, 6-1 and book her place in the last 16 in Madrid.
After losing the final in Stuttgart on Monday, Sabalenka will be keen to go deep in Madrid and make a statement.
12:35 CET - The men's seventh seed and reigning champion is out! Andrey Rublev has been beaten 6-4, 0-6, 6-4 by Alexander Bublik in our first upset of the day.
09:25 CET - Hello and welcome to Flashscore's coverage of today's action from the Madrid Open!
The day's starting with a bang, with world number one Aryna Sabalenka battling it out with Elise Mertens for a place in the round of 16 at 11:00 CET.
There are a number of eyecatching matches that will follow that, including:
Alexander Zverev vs Alejandro Davidovich Fokina - 13:00 CET
Maria Sakkari vs Jasmine Paolini - 13:00 CET