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Naomi Osaka seems to be struggling slightly with the length of her shots. She's going for power, but far too often she's overcooking them.

Another long forehand hands Sorana Cirstea a break point.

A forehand error from Stan Wawrinka - Arthur Gea breaks back!

The Frenchman receives some treatment to his knees at the change of ends.

Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Sports Extra and BBC Sounds

You have to expect the unexpected against a quality player like Jannik Sinner who is able to pinpoint that backhand to all corners.

A double fault and a long forehand leave Stan Wawrinka 0-30 down.

He responds with an ace and a wide serve to Arthur Gea's backhand, which is returned long.

However, with a cushioned volley at the net after overpowering Wawrinka with repeated deep returns into opposite corners, Gea has an opportunity to break back.

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It's been a near-faultless start from Jannik Sinner.

That's three service games for the loss of just three points as he backs up the break for a 4-1 lead. Not much James Duckworth can do about this!

Naomi Osaka holds her hands up in apology after a lucky net cord takes all the power out of her shot and catches out Sorana Cirstea.

The Romanian watches the next point fly long from Osaka's racquet before she flings a forehand winner down the line to grab the hold.

Jannik Sinner is already knocking at the door on Rod Laver Arena.

The Italian will have a look at two early break points...

And he takes the second with a stunning two-handed backhand down the line! Great shot.

After those early struggles, Naomi Osaka looks like she's fully up to speed now and has got her rhythm back - holding to love.

That's three games in a row for the former world number one.

Stan Wawrinka breaks early in the decider, pointing to his temple as Arthur Gea sends a forehand wide.

He's won four consecutive games.

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Spare a thought for Arthur Gea. On any other day, the French qualifier, ranked 198th in the world and playing in the main draw of a Grand Slam for the first time, would be enjoying the support of the crowd. Not today.

Stan Wawrinka unleashes a trademark backhand which fizzes cross-court. Two break points.

It's a lacklustre second serve from Sorana Cirstea and Naomi Osaka takes advantage, replying with a backhand winner down the line.

It's two service games for the loss of just two points so far for Jannik Sinner.

The second seed appears to be firing on serve today.

He's landed eight of his 10 first serves in, with five aces already on the board.

What a hit! Naomi Osaka somehow reaches a return from Sorana Cirstea on the stretch before racing back across the court to get to the next one. And she lands that one perfectly, squeezing a backhand pass between Cirstea at the net and the corner of the court.

And now the 28-year-old has the chance to break as Cirstea goes long.

A 17-shot rally to open the fifth set, Stan Wawrinka running to all corners of the court, and it's the Swiss who comes out on top. He revs up the crowd in celebration. The 40-year-old is loving this.

A hold to 15 is sealed with an ace. Roars all around the crowd.

James Duckworth digs deep to win an important point at deuce, eventually wearing Jannik Sinner down with a backhand volley ending a 21-shot rally.

The Italian doesn't really give up easy points, as Duckworth will be fully aware, but the Australian does well to get over the line and hold in his first game to the delight of the majority of those inside Rod Laver Arena.

A better service game from Naomi Osaka and she's on the board, wrapping up the hold with a cross-court backhand winner.

The four-time major winner was looking a bit flustered in those opening two games, but it seems like she's regained a bit of composure now.

Stan Wawrinka hasn't reached the third round of a Grand Slam since the 2023 US Open.

He's twice come from behind to take this match into a fifth set. He couldn't... could he?

Wawrinka will serve first.

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This one is going all the way!

Stan Wawrinka breaks Arthur Gea with another perfect backhand down the line and the 40-year-old fights on in his final Australian Open appearance.

The world number two holds in a comfortable opening service game, but home favourite James Duckworth manages to fire in a forehand winner before he does so to get the crowd pumped up from the start.

Naomi Osaka's forehand is looking a bit wobbly as she loops another one wide, and then another one long.

Her backhand looks a bit better as she slams a winner down the line.

When Osaka does find the court, Sorana Cirstea is there to deal with it and she gets the hold to back up the break.