A double fault from Rebecca Marino gives Katie Boulter a glimmer of hope, but the 22nd seed is too eager to take advantage and overhits the forehand.

There's too much power on her next strike, too, and that gifts Marino the hold.

Lovely. Katie Boulter gets herself on the second-set scoreboard with a delightful forehand that she flings across the court to leave Rebecca Marino rooted to the spot.

It's better, but she needs to stop the Canadian's momentum on serve.

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Katie Boulter needs to stop the rot here. The British number one is struggling on serve, and it's only thanks to a lucky net cord that she finds herself at 30-30 with Rebecca Marino.

Daniel Kiernan
Former British tennis player

I talk a lot about hitting the spots and not the slots.

When you hit the slot, the ball will come back just as fast - especially when you have someone who is able to time the ball like Rebecca Marino does on that backhand side.

It's a funny old game because Katie Boulter looked so comfortable and at ease. She was hitting the spots on her serve and all of a sudden she has lost maybe eight out of nine points at the start of this set.

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Andrey Rublev appears to have a fight on his hands over on Margaret Court Arena.

The Russian ninth seed has just lost the opening set in a tie-break, which Brazil's 18-year-old qualifier Joao Fonseca dominates 7-1.

Neither player could make a breakthrough in the opening six games, but Fonseca took charge of the tie-break after racing into a 4-0 lead and then closed it out by rattling off another four consecutive points.

After a closely contested first set, Katie Boulter is in trouble in the second as Marino opens up a 3-0 lead after finding her stride on serve for a hold to love.

Alex de Minaur is playing some vintage tennis on Rod Laver Arena.

Both players have held their service games in this set so far, but the Australian still remains in firm control of this first round match.

Botic van de Zandschulp is hitting with some power but the Australian is still covering the court with ease and staying in the rallies, even this far into the match.

You get the feeling that De Minaur is ready to close this one out now.

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Straight into the net from Katie Boulter, who stands still on the baseline looking dejected while Rebecca Marino raises a clenched fist towards her team.

The Canadian got the early break in the first set but she couldn't make the most of it. Can she back it up this time?

A nice switch in play from Rebecca Marino, who effortlessly swaps a powerful forehand for an equally impressive backhand that whizzes by the head of Katie Boulter.

The Canadian has stepped it up a gear and she's got herself two break points.

Katie Boulter isn't one to hide her emotions, and after the joy of winning that opening set, she's left scolding her ball-hitting as Rebecca Marino gets through a straightforward hold.

Yes she can! A huge roar and a big smile from Katie Boulter as Rebecca Marino fails to get enough power to lift the Briton's serve back over the net.

One step closer to the second round.

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Back and forth we go, Katie Boulter has got a third set point. Can she make it third time lucky?

Daniel Kiernan
Former British tennis player

A little technical observation I made about Katie Boulter during the Billie Jean King Cup was that when she is taking that forehand on, she likes to catch the contact point a little bit late.

Her preference tends to be going into Rebecca Marino's backhand, which is her strength, and it actually takes a little bit more for her to be able to pull that ball into the forehand.

But, for now, she is having some joy and finding the corners of the court and Marino is struggling to get into her service games.

Rebecca Marino is on a roll. She's sensing some nervousness from Katie Boulter and taking advantage, saving two break points before racing to the net to bring up a break point of her own.

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Katie Boulter advances to the net, and Rebecca Marino can't find the court with the lob return. Another set point for the Briton.

Nope, not this time. Katie Boulter can't deal with that Rebecca Marino forehand and we go to deuce.

Set point Katie Boulter as Rebecca Marino fires long.

There has just been some outstanding play on Rod Laver Arena!

Botic van de Zandschulp has just played an outrageous winner from a difficult-to-get lob from Alex de Minaur.

The Australian thought he had hit a winner, but Van de Zandschulp managed to recover and play an even better shot to win the point and close out the game.

Patient play from Katie Boulter, who absorbs the power before upping the intensity and taking control.

Rebecca Marino finds herself 30-0 down after another miss, but she pushes over a backhand that Boulter can only send into the net.

There's another ball into the fence from the British number one. 30-30.

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Daniel Kiernan
Former British tennis player

If you are a big server and you make your wage through your service games, you have to serve at more than 42%.

Right now, Rebecca Marino is at 42% and Katie Boulter is at 48% but Katie has been winning 64% of her second serve points and Rebecca has only been winning 36%.

That's the tale of the match so far. They are two players that very much rely on hitting their spots, serving big and getting the first big strike in.

And so far it has been Marino who has been first to blink.