Live updates: Brisbane International, United Cup day six — Australia faces Great Britain as it chases quarterfinal berth

The Aussies have made a late change to their mixed doubles line-up.

Alex de Minaur will team up with Olivia Gadecki after Matt Ebden and Ellen Perez were initially listed on the team sheet.

The Brits have also made a change with Olivia Nicholls replacing Katie Boulter.

Nicholls will partner Charles Broom.

The switch made by Great Britain means de Minaur and Boulter won’t have to face each other on opposing sides of the net.

De Minaur and Boulter announced their engagement just prior to Christmas.

Australian 18-year-old Maya Joint is meeting the challenge of playing Victoria Azarenka with relish.

Joint won the first set of the round-of-32 match in a tie-breaker (7/5).

She and Azarenka have traded breaks early in the second set.

Alex de Minaur has made sure the mixed doubles is a live rubber with a resounding straight-sets win over Billy Harris.

De Minaur broke the Briton for a fifth time to complete a 6-2, 6-1 victory.

The Aussies are still a chance of reaching the quarterfinals, but it will come down to the mixed doubles.

With a hometown crowd cheering him on, Alex De Minaur has gained a double break in the second set to lead 4-1 against Billy Harris.

A de Minaur win will see Australia level the tie against Great Britain at 1-1.

Alex de Minaur is moving closer to victory in his singles match against Billy Harris.

Some breathtaking court coverage saw the Aussie win his most recent service game after he broke Harris at the beginning of the second set.

De Minaur, the world number nine, leads 2-0 in the second set after winning the first 6-2.

It’s still early days, but Aussie young gun Maya Joint is getting on top of Victoria Azarenka in Brisbane.

While Joint was broken by Azarenka, she has grabbed two service breaks against the two-time Australian Open champion to lead 4-2 in the first set.

Alex de Minaur serves to love to see out the first set in 38 minutes.

De Minaur won the set 6-2, having twice broken Billy Harris’s serve.

Alex de Minaur will serve for the first set at 5-2 against Great Britain’s Billy Harris.

The Aussie broke Harris’s serve for the second time in the seventh game.

Alex de Minaur is getting on top of Billy Harris in their singles rubber in Sydney.

The Australian men’s number one broke his British opponent in the fifth game of the first set to establish a 3-2 lead.

De Minaur’s partner Katie Boulter had earlier put Great Britain 1-0 ahead following her victory over Olivia Gadecki.

Great Britain has automatically advanced to the quarterfinals, courtesy of Boulter’s straight-sets win, but Australia is still a chance of reaching the knockout stage.

Alex de Minaur has relaxed the nerves to win his first service game against Great Britain’s Billy Harris.

Harris had earlier held serve in front of a parochial Ken Rosewall Arena crowd who have — politely — let the Briton know they are behind their local hero de Minaur.

In a match lasting a gruelling three hours and 21 minutes, world number nine Daria Kasatkina was pushed to the brink before prevailing against American Peyton Stearns.

Russia’s Kasatkina, seeded three in Brisbane, drew upon all of her energy reserves to win 7-6 (9/7), 4-6, 7-5.

Meanwhile, Ukrainian 16th seed Dayana Yastremska departed the tournament after a 7-5, 6-4 loss to Russia’s Anastasia Potapova.

Australia’s top-ranked men’s player Alex de Minaur is warming up for his singles rubber against Great Britain’s Billy Harris on Ken Rosewall Arena.

We’ll keep you updated throughout the match.

Katie Boulter breaks Olivia Gadecki’s serve to put an exclamation mark on an impressive victory in the opening singles rubber.

Boulter was victorious 6-2, 6-1 over Gadecki to give Great Britain a 1-0 lead over Australia.

The straight-sets win put Great Britain into the quarterfinals, but Australia can still advance — as the top second-placed team in Sydney — via results in the remaining singles and mixed doubles rubbers.

Boulter will now watch on as her partner, Australian men’s number one Alex de Minaur, faces her British teammate Billy Harris.

Australia has its back to the wall early in their final group tie against Great Britain.

She won the first set comfortably, now Great Britain’s Katie Boulter has two service breaks early in the second against Australia’s Olivia Gadecki.

Boulter leads 3-0 in the second set on Ken Rosewall Arena.

She won the first set 6-2.

Great Britain is edging closer to going 1-0 up in its group tie against Australia at Ken Rosewall Arena in Sydney.

Highlighted by securing a double break, Katie Boulter dominated the first set of the opening singles rubber against Olivia Gadecki, winning 6-2.

Boulter landed 75 per cent of her first serves and posted three aces.

Katie Boulter has a service break up her sleeve in her singles rubber against Australia’s Olivia Gadecki.

The Briton leads 3-2 in the first set.

Play is underway in Australia’s United Cup tie against Great Britain.

Australia’s Olivia Gadecki is facing Katie Boulter in the opening singles rubber.

Later, Gadecki’s compatriot Alex de Minaur will meet Billy Harris in the second singles match.

The doubles run of Nick Kyrgios and Novak Djokovic has come to an end in Brisbane at the hands of top seeds Nikola Mektić and Michael Venus.

Kyrgios and Djokovic sent the contest against into a match tie-breaker after winning the second set 6-3.

But the doubles experience of Mektić and Venus shone through when it mattered most, with the duo clinching the tie-break 10-8.

They won the first set 6-2.

The tournament isn’t over for Djokovic, however, as he remains in the hunt for the singles title.

He faces French veteran Gaël Monfils in the last 16.

Poland has moved through to the knockout stage of the United Cup with a 2-1 triumph over Czechia.

Iga Swiatek and Hubert Hurkacz teamed up to defeat Karolina Muchova and Tomas Machac in the deciding mixed doubles rubber, 7-6 (7/3), 6-3.

The singles matches had earlier between shared between Poland and Czechia.

Machac got past Hurkacz 7-5,3-6, 6-4 in the men’s rubber, but Swiatek levelled for Poland with a 6-3, 6-4 win over Muchova.