Out? No, correction on a long Bernarda Pera zinger that rattled the wrists of Johanna Konta. The point will be replayed, but this time Konta thumps it long.

Fantastic from the American. No doubt about that one, a passing winner return with Konta rooted to the spot she served from - 0-30.

It's wide! Bernarda Pera will challenge this...

But that's all tramlines. Johanna Konta breaks back.

Pera drops a weak forehand to mid-court and Konta punishes it with a sizzler of a forehand winner.

The American catches net from another undercooked forehand moments later.

Break point Konta.

Bernarda Pera flings a double-handed backhand long from the baseline, but a Johanna Konta mishit drifts wide on the next point.

She's yet to find the sweet spot today - 15-15.

Naomi Broady
British number three on BBC Radio at Melbourne Park

To be able to play those shots under pressure shows what great mental strength Jo's got.

Image source, Getty Images

Johanna Konta is having to dig extremely deep here, but dig she does and the British number one holds serve after giving Bernarda Pera three match point opportunities.

A neat volley from close range does the trick.

Pera to serve for the match.

Third match point for Bernarda Pera.

Johanna Konta watches the American's loose return all the way on to her racquet and slams a volley into the open court to level at deuce.

She follows up with another punchy serve. Advantage Konta, but that's a fearsome crosscourt forehand winner from Pera on her left and we're back to deuce.

Naomi Broady
British number three on BBC Radio at Melbourne Park

Konta's coach has got the chewing gum going on like Alex Ferguson used to do.

Oh no. A huge gust of wind puts Johanna Konta off on her serve and she double faults.

Why didn't the Briton let that pass? Another match point for Pera...

The American goes long with her return, but gets ANOTHER chance after another wayward Konta stroke.

Wowza, that had it all - mishits, punchy returns, sky balls and finally a Pera backhand into the net.

Brief relief for Konta.

Deuce.

Deuce.

Bernarda Pera gets the better of a 14-shot rally after Johanna Konta clubs a forehand that caught the line high into the Melbourne sky.

Another error follows from the British number one.

Match point Pera.

Bernarda Pera looks to the skies, a swerving left-handed forehand drifts long after some gutsy groundstrokes from Johanna Konta.

But the American stands up the Briton's arsenal on the next point, opening up and dishing out a ferocious winner.

Konta can't pick a backhand up and rattles the tape - 30-30.

Ruthless serving from the American.

It's hotting up out there, but Bernarda Pera coolly puts Johanna Konta away to hold.

One hour, 14 minutes gone. Johanna Konta is a set and a break down.

What's the British number one got in the tank?

She goes 0-15 up, but Bernarda Pera responds to 30-15 before whacking a looping Konta return into the net on the volley.

Naomi Broady
British number three on BBC Radio at Melbourne Park

It's just too good from Pera so far. When your opponent is playing as freely and as well as Pera is doing, you just have to keep fighting and hope that when it comes to close the match up she tightens up and loses a bit of form.

Cat Archer
BBC Radio 5 live sports extra at Melbourne Park

Image source, BBC Sport

There'll be a queue for these by now. Gigi Salmon and Russell Fuller were doing their hair advert best in the wet mist earlier.

Image source, BBC Sport

Even the posters around site are on message. 35 and rising.

Konta recovers to deuce, but there's great length on a backhand from Pera that brings a wild and off-target response from the Brit.

The umpire calls her next effort out, Konta challenges... but it's wide. Pera breaks.

Bernarda Pera almost does the splits as she slides into a left-handed forehand winner down the line - remarkable!

A fourth break point for the American.

Much better from Johanna Konta, forcing Bernarda Pera wide right from her serve before firing a winner to the American's left.

But we're back at break point as the British number one follows up a miss by parrying a volley into the guts of the net.

Konta saves the first, and Pera goes long from the ninth seed's second serve on the next.

Deuce.