There goes the winner from Elina Svitolina!

The first set goes the Ukrainian's way.

Oops. A shank and a half from Katie Boulter to begin with and she's quickly 0-30 down as she misses with the backhand.

Trouble here, Svitolina finding the lines, and Boulter is going to have to save three set points...

Here we go.

Twentieth seed Felix Auger-Aliassime is one of the main first-round casualties.

The Canadian teenager, who reached the third round at Wimbledon last year and the Miami Open semi-finals, went out to 256-ranked Ernests Gulbis 7-5 4-6 7-6 (7-4) 6-4.

Gulbis has been as high as number 10 in the rankings but he this is his first win at a Slam since 2018.

There were, however, wins for Austrian fifth seed Dominic Thiem, Spain's ninth seed Roberto Bautista Agut and Argentine 14th seed Diego Schwartzman.

Stan Wawrinka, who won the title in 2014, progressed in four sets, while former finalist Marin Cilic and 2016 semi-finalist Milos Raonic won in straight sets.

Image source, AFP

Oh! A great opportunity for Katie Boulter as she gets Elina Svitolina on the run, but she sends her backhand cross-court rather than down the line, and Svitolina passes her at the net with a winner.

Svitolina gets herself to 40-15 before she watches a Boulter backhand go firing past her. Boulter is pushing, getting forward, trying to win the rally, but a drive volley is seen off by Svitolina and she cracks a winner into the corner of the court to hold.

Jonathan Jurejko
BBC Sport at Melbourne Park

Katie Boulter said she was "in a good place physically" when she spoke to the media on Friday - and so far she's been true to her word.

The 23-year-old will need to be if she's going to have any success. Svitolina does more fetching and returning than a hod carrier.

A crisp return of serve from Svitolina gets her on the board first up, but the fifth seed misses a straightforward forehand for 15-15.

Svitolina should have a break point as she tries to angle a forehand past Boulter but she misses, and another pummel from the baseline by the Ukrainian finds the net. Boulter holds to 30.

World number one Rafael Nadal cruised into the second round with a straight-sets victory over Bolivia's Hugo Dellien.

Nadal dropped just five games en route to a 6-2 6-3 6-0 victory.

A reminder that he's bidding to equal Roger Federer's record of 20 Grand Slam titles...

Image source, Getty Images

Katie Boulter hits her racquet in frustration as she tries to block an Elina Svitolina serve and it doesn't clear the net.

She's on the back foot in this mini-rally and Svitolina holds as Boulter misses from the baseline.

Brilliant from Svitolina! She's on the back foot, Boulter stepping forward, pushing her in the rallies, and Svitolina charges around behind the baseline, getting each ball back before Boulter nets a return.

That's a stonker of a winner from Boulter, mind, sending Svitolina's serve down the line for 30-15.

Now then. Another error from Svitolina, and it's 30-30...

Jonathan Jurejko
BBC Sport at Melbourne Park

If cheap Danish lagers did tennis backdrops...

Earlier, the same seats did not offer a landscape as pretty, with a slight cloud cover when Johanna Konta lost to Ons Jabeur.

Now the sky and sun is as bright as the Freisian cow-patterned skirts donned by Boulter and Svitolina.

In the background you can see the high-rise Southbank area, which is home to the Melbourne's iconic arts centre and Eureka - the tallest skyscraper in the city.

A cross-court miss from Katie Boulter puts her under a shade of pressure, but she hammers a serve down the T before following it up with a winner for 30-30.

These serves are quick from Katie Boulter, coming down to Svitolina with some pace, and it's Boulter who profits as the Ukranian pushes a backhand over the baseline. It's all square.

Russell Fuller
BBC tennis correspondent at Melbourne Park

Kyle Edmund played well in the first set yesterday but didn't start as well as he'd like against a very talented opponent. He was just outplayed by the better man.

It's a bit frustrating, he had a good end to last year and had quite a few wins in his last dozen or so matches. But he doesn't really own the court at the moment and I get the sense life is a bit of a struggle on tour for him.

That's more like it from Elina Svitolina, cracking down an ace as she rattles through a love hold.

David Law
BBC Radio 5 Live Sports Extra tennis commentator

It's difficult because we really want an insight into what's going on, but Johanna Konta has always been someone who packages her answers in terms of the process. That's how she goes about her business and has produced some fantastic results.

But this will have been a disappointment, no matter what she said. The bigger question is what she does going forward? She needs her legs and relentless groundstrokes.

Another huge first serve from Katie Boutler, this time out wide, takes her to game point.

And it'll be game to the Brit as Svitolina clatters a return into the net cord.

Hello. A pacey first serve from Katie Boulter and Elina Svitolina, leaning back, cannot return it.

Boulter opens the door for Svitolina with a sliced backhand from the back of court that drifts well long for 30-30, but she comes out on top in a rally with a cry of "come on!"

Good defence from Svitolina, forcing Boulter into one forehand too many, and we're at deuce.

Russell Fuller
BBC tennis correspondent at Melbourne Park

A very disappointing night indeed when you consider both Johanna Konta and Kyle Edmund have been semi-finalists at the Australian Open.

Konta, it's a bad defeat on paper, but I do think we hear from her time and time again "it's all part of the process" - I think it might be, given the knee problems from last year.

I don't think she's too downhearted.

Image source, AFP

British number one Johanna Konta looked short of match fitness as she lost to Ons Jabeur in the first round. The 12th seed, beaten 6-4 6-2, was playing only her second match in almost five months because of a knee injury.

Maria Sharapova also suffered a first-round exit at Melbourne Park for the first time since 2010, losing 6-3 6-4 to Donna Vekic, and is now set to drop out of the world's top 350.

Elsewhere, world number two Karolina Pliskova beat Kristina Mladenovic and is joined in the second round by Swiss sixth seed Belinda Bencic, American 10th seed Madison Keys and Greek 22nd seed Maria Sakkari.

If you've missed the overnight action because you, wisely, decided to get some sleep, here's what's been going on...