This is where we end the blog tonight and what a finish, with Reilly Opelka’s surprise win.

Saturday is semi-final day for both the Brisbane International and United Cup and ABC Sport will bring you all the key results digitally.

Enjoy the rest of your evening!

Reilly Opelka spoke to the Nine Network after his win over Novak Djokovic.

The reality is that we have nothing to lose by competing against him. He’s the best player of all time, so in the end you play more freely… you take a lot more risk because it’s the only chance.

When asked how he kept his composure during the game, Opelka replied:

I just concentrated on my spots. When I hit them, it’s hard to hit them back. If there’s anyone who can do it, it’s him, and I was prepared for it.

Reilly Opelka sits in the box seat and leads Novak Djokovic 5-2 in the second set.

Both players won their last service games.

Considering how well Opelka served tonight, it’s hard to see how Djokovic can fight back considering he has a break in the second set.

It’s now 4-1 for Reilly Opelka after he held serve in the fifth game.

The American fired 14 aces in this match, landing 81 percent of his first serves.

Opelka has had a career marred by injuries, but was ranked 17th in the world in 2022.

Are we in for a surprise?

Reilly Opelka delivers first-class tennis against Novak Djokovic.

He defeated Djokovic in the fourth game of the second set and led 3-1.

He had previously won the first set in a tiebreak (8:6).

Reilly Opelka used the advantage against Novak Djokovic and secured the tiebreak 8:6 with an ace in the middle.

The oversized American – 6’11” (211 cm) tall – converted his second point of the set.

Djokovic seemed frustrated by the change of sides, but if there’s one player who can get out of this position, it’s the 24-time major winner.

No surprises here… the first set is decided by a tiebreak.

It’s about waiting for one of them to blink.

Novak Djokovic and Reilly Opelka haven’t even given up a break point in the first set so far.

It’s 4:4… are we facing a tie-break?

Both Novak Djokovic and Reilly Opelka have entered the Pat Rafter Arena ahead of their quarterfinals.

The winner of tonight’s game will face France’s rising star Giovanni Mpetshi Perricard in tomorrow’s semi-final.

Aryna Sabalenka moves into the semi-finals after defeating Marie Bouzková without losing a set.

Sabalenka’s serve was broken just once en route to a 6-3, 6-4 victory.

The world number one’s next opponent will be Russian sensation Mirra Andreeva in the quarterfinals.

Aryna Sabalenka has a set and a lead in her quarterfinal against Marie Bouzková.

The reigning US Open champion is serving 2-1 in the second set after winning the first 6-3.

The Czech Republic is in the semi-finals against the USA in Sydney.

Tomáš Macháč secured the Czech Republic’s place in the last four with a first-class 6:1, 6:2 victory over Italian Flavio Cobolli.

Previously, Karolína Muchová defeated Jasmine Paolini 6:2, 6:2.

The semi-finals will be played on Saturday.

Aryna Sabalenka converts her first set point against Marie Bouzková and leads 6:3.

Sabalenka scored 19 winners in the opening set compared to her opponent’s seven wins.

But her unforced error count rose to 11.

The winner of today’s quarter-finals will face 17-year-old Russian Mirra Andreeva in the semi-finals.

Aryna Sabalenka is 5-2 ahead in the first set against Marie Bouzková.

A second break of Bouzková’s serve has given the two-time defending Australian Open champion some breathing room as she hopes to reach the semi-finals.

The Czech Republic is one step closer to reaching the semi-finals in Sydney.

Tomáš Macháč won the first set in the men’s singles against the Italian Flavio Cobolli 6:1.

Karolína Muchová had previously beaten Jasmine Paolini 6-2, 6-2 in the women’s singles.

The games are on serve, with Aryna Sabalenka breaking back against Marie Bouzková.

After a long second game in the first set the score is 1-1.

The last time the two met on court, Bouzková triumphed in three sets in Washington last year.

Sabalenka won her only other WTA Tour match when she defeated Bouzková in Miami in 2023.

An early setback for Aryna Sabalenka as the world number one dropped her serve in the opening game of the match.

Marie Bouzková serves 1-0.

Two games back and three more to win if Aryna Sabalenka is to lift the trophy in Brisbane.

Her next challenger is Marie Bouzková, who reached the quarterfinals by defeating Victoria Azarenka.

Games are underway at Pat Rafter Arena and we’ll keep you updated throughout the game.

France’s Giovanni Mpetshi Perricard will play the semi-finals in Brisbane after defeating Jakub Menšík in straight sets.

Mpetshi Perricard won 7-5, 7-6 (7/5).

He will wait for the winner of tonight’s quarterfinal between Novak Djokovic and Reilly Opelka.