Alexander Zverev (3) 4-5 6-3 Learner Tien* (25) The ninth game of the second set commences with both players still searching for a break but with Zverev’s serve on point, there’s a growing sense that it’s Tien that needs to find something new if he’s going to take control of the match.

The American fires a shot wide and into the net to surrender the first point of the game but is back level when Zverev sends a forehand into the net. The 25th seed takes the next two points, the latter won with a big forehand winner up the line, but then watches Zverev return the favour to make it 40-30.

Deuce is then secured but a golden chance to bring up break point is blown when Zverev charges the net only to loft a forehand out with most of the court to aim at. Tien then utilises the reprieve to secure the hold.

Alexander Zverev* (3) 4-4 6-3 Learner Tien (25) Zverev sends a backhand into the net to open things but responds with a 204 km/h serve Tien can’t return. Tien gets on top of Zverev’s subsequent second serve but commits a frustrating error to fall further behind but Zverev then commits an unforced error of his own when he pushes a forehand out.

Tien then finds an angle as Zverev charges forward and induces an error – the first point Zverev has lot coming to the net today – and brings up break point. Zverev dashes those hopes, however, and brings up deuce with an ace smashed down the T. An extended rally ends with Tien sending a backhand into the net and responding by smashing the top of his racquet into the surface in frustration. But he’s able to channel that anger into a top return of serve and a magnificent drop shot that leaves Zverev scrambling.

But here comes that big serve once again, Zverev firing down a wide ace to seize the advantage and then using a forehand winner to take the game.

Alexander Zverev (3) 3-4 6-3 Learner Tien* (25) An hour of match time is brought up as Tien serves, falling behind after hitting a backhand into the net at the end of a 22-shot rally in which both players clipped the net.

An unreturnable serve gets Tien back level and he shows the initiative to get to the net and force a wild attempted passing shot to move ahead. Zverev levels but just sends a backhand long to miss out on break point. The German does bring up deuce and pushes Tien but the American is able to force a forehand error to take the advantage and then secures the game with a serve Zverev can’t return.

Alexander Zverev* (3) 3-3 6-3 Learner Tien (25) A big ace down the T starts things off well for Zverev but the American recovers and takes a 10-shot baseline exchange with a big backhand kept just inbound.

But the third seed’s serve continues to prove telling whenever he’s challenged and he secures yet another hold with his eighth ace of the match.

Alexander Zverev (3) 3-2 6-3 Learner Tien* (25) An unforced error from Tien, dropping a backhand into the net, moves Zverev ahead. A leaping backhand is blasted into the net by the third seed to level things back up and Tien then advances to the net and cuts down on the angles to induce another error.

A cheeky drop shot catches Zverev off guard and makes it 40-15, before Tien gets to the net and forces an error to take the game.

Alexander Zverev* (3) 2-2 6-3 Learner Tien (25) Zverev kisses a forehand deep and wide an induces a forehand error from Tien to move ahead, with an ace sent down the T then getting him further in front. A serve and volley combination then makes it 40-0 and while he sends a baseline forehand long to miss out on the chance to hold to love, a second ace of the game wraps things up.

Alexander Zverev (3) 1-2 6-3 Learner Tien* (25) Zverev gets to the net and smashes down a crosscourt forehand winner to move ahead. Tien fires back with the next three points and while Zverev responds with a forehand that forces the error to make it 40-30, the American takes the game with a commanding overhead winner.

Alexander Zverev* (3) 1-1 6-3 Learner Tien (25) An extended, 18-shot baseline rally ends when Tien finds the angle and drives a backhand winner beyond Zverev. A powerful serve forces an error that brings Zverev back level and he then fires down an ace to move ahead. The third seed smashes a forehand down the line to make it 40-15 and then uses yet another powerful first serve, this one sent back into the net by Tien, to claim his first game of the second set.

Alexander Zverev (3) 0-1 6-3 Learner Tien* (25) Tien quickly moves to a 40-15 lead in the second set’s opening game but then double faults, giving Zverev a sniff. The American responds, though, and takes the game when an extended baseline rally ends with the German committing an unforced forehand error.

Zverev did what he need to do to ease to that first set win: landing 70% of his first serves across the opening set, compared to just the 46% by Tien. And while the American is winning 82% of his first serves, that drops to 46% on his second.

Alexander Zverev (3) 5-3 Learner Tien* (25) An unforced forehand error on a deep return from Zverev sees Tien give up the first point but he gathers himself and takes the next three to move to 40-15. A really well-placed second serve ace, one that leaves Zverev blinking, then wraps up the hold.

Alexander Zverev* (3) 5-2 Learner Tien (25) Tien takes the first point but sends a shot long at the end of a 13-shot baseline battle to be pegged back. Zverev works the bounce well on second serve once more to move ahead but Tien fires back with a forehand down the baseline that Zverev is forced to stretch for and fail to slice back over the net.

A mishit backhand slice from Zverev collects the net and brings and gives Tien his first break point of the match but the third seed fires across another unreturnable serve to make it deuce. The German than moves into the advantage with a big forehand but Tien pegs him back by moving him around the court and ultimately forcing an error.

Zverev gets to the net and regains the advantage by dropping a shot that angles away from Tien’s charge. Another big serve is then unable to be returned and the hold is secured.

Alexander Zverev (3) 4-2 Learner Tien* (25) Zverev takes the first point but Tien answers back by forcing two errors – the second at the end of a nine-shot rally – to move ahead 30-15.

But another double fault – Tien’s second – brings Zverev back level and an unforced forehand error than brings up the game’s first break point. The American rallies to bring it back to deuce only to fall behind once again and this time, the break comes: Zverev letting out a guttural yell as he watches a Tien forehand go wide.

Tien is landing just 47% of his first serves and winning just 40% of his second serves. Danger signs.

Alexander Zverev* (3) 3-2 Learner Tien (25) A nicely placed forehand from Tien can’t be returned by Zverev and ends a 10-shot baseline rally. Two powerful serves from Zverev result in him coming back to claim the ascendency and he uses then uses a mammoth bounce on second-serve to induce the error that makes it 40-15.

There’s a brief pause as Zverev sees… something (?) he doesn’t like but that doesn’t stop him from firing a forehand winner from the baseline to hold serve.

Alexander Zverev (3) 2-2 Learner Tien* (25) Both players have their serve working early, Zvrev missing three returns in a game sealed when Tien firs a 201 km/h ace down the T.

Alexander Zverev* (3) 2-1 Learner Tien (25) Tien sends a backhand long to give Zverev the first point but is able to force his opponent to scramble and send a backhand wide to level things.

An unforced forehand error from Zverev sees him fall behind but he responds with a devastating ace sent wide. The German then moves ahead with a forehand winner and follows that up with a powerful serve Tien can only return long to take the game.

Alexander Zverev (3) 1-1 Learner Tien* (25) Tien looks to answer straight back by racing to a 40-0 lead and while a double fault denies him a hold to love of his own, Zverev sends a deep forehand long to hand him his first game of the contest.

Zverev (3) advanced past Argentine Francisco Cerundolo (18) in straight sets the fourth round, after previously defeating Cameron Norrie (26), Alexandre Muller, and Gabriel Diallo.

Tien (25) surprised many by dominating Daniil Medvedev (11) to punch his ticket to the quarterfinals and has also beaten Nuno Borges, Alexander Shevchenko, and Marcos Giron so far.

Before we start the actual tennis, it’s time for another episode of the Fashion Files. Both players are highlighting their ensembles with a dash of orange this afternoon, Zverev donning an orange headband and Tien an orange cap, wristbands, and socks. Both belligerents are wearing white t-shirts, while the third seed has opted for black shorts and the underdog opting for a white pair that matches his top.

As a horde of influencers descend upon the Australian Open this year, the off-court fashion has become much more noticeably this year, too, as Lucianne Tonti has explored today.

No doubt the black Chuck Taylors, black jeans, and black t-shirt I donned to cover the A-League Men across the road at AAMI Park yesterday is going to start a trend any day now.

The Heat Stress Scale has moved past 5.0, prompting a swathe of suspensions across the outdoor courts in Melbourne.

Given that it’s taken place between matches, however, it doesn’t look like it’s going to delay the start of Zverev and Tien – the pair making their way out onto Rod Laver Arena as I type.

We said goodbye to Casper Ruud (12) last night but, perhaps, not a moment too soon: the Norwegian now able to return home to be with his wife, Maria, ahead of the expected birth of their first child this weekend.

Tumaini Carayol was on hand as he went down 3-6, 6-4, 6-3, 6-4 to Ben Shelton (8).

In case you missed it yesterday, youngster Ntungamili Raguin made history: becoming the first player from Botswana to win a Grand Slam match when he defeated Dimitar Kisimov 7-5 6-1 6-4 in the junior boy’s singles.

Out on on Margaret Court Arena, fourth seeded women’s duo Elise Mertens and Shuai Zhang have taken out the opening set of their clash with American team Hailey Baptiste and Peyton Stearns 6-4. The winner of that match will face Eri Hozumi and Fang-Hsien Wu in the quarterfinals, who upset eighth seeds Ellen Perez and Demi Schuurs.

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Aryna Sabalenka (1) 5-0 6-3 Iva Jovic (29) Before we take you through the rest of the colour of today’s action and run down what you may have missed yesterday, though, we’ll need to turn our eyes to Rod Laver, as the top seed is threatening to make light work of her American challenger in the second set.

As the Heat Stress Scale hits 4.0, a remarkable passing backhand brings up yet another break point for Sabalenka, with a third-straight break then secured when Jovic double-faults.

Could de Minaur be said to have twice the home court advantage today; the ‘Demon not only playing in front of his home fans but also taking the court on a day that’s hot as hell?

Admittedly, the extreme heat means that the roof is likely to be closed when he takes the court against Alcaraz later today – the air conditioned conditions ensuring the temperature won’t play a defining factor in the result – but this, too, could prove something of a bonus to the Sydneysider.

Simon Cambers explains how.