Raducanu brings Gauff back to deuce. The crowd are really engaged in this now!

The 'oohs' and 'aahs' are coming from all corners of Rod Laver Arena as this tense game rumbles on. A smash gives Gauff her third opportunity to end it.

Almost exquisite by Raducanu, but again the set point passes her by as a sliced backhand drops short of the net.

Ah, that's a frustrating miss by Raducanu!

Gauff is passive in the rally but the Briton goes for it and sends a backhand long.

Another chance quickly comes her way.

Another unforced error from the increasingly unsure Coco Gauff.

Set point, Emma Raducanu!

More signs of nerves from Coco Gauff.

A double fault, followed by a poor miss, bring Emma Raducanu to deuce - and a couple of points away from levelling this match.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra

Raducanu is getting into Coco's head. Her forehand is really hesitant rather than releasing and flowing.

That's three games in a row now for Emma Raducanu, who is suddenly right back in this fight.

Another break here and she would have all the momentum going into a decider.

A shake of the fist from Emma Raducanu as a ferocious backhand gets her up and running and some aggressive play, coming forward to smack down a volley, gives her 30-15.

And that's four successive points for the Briton after more unforced errors from Gauff.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra

Gauff is looking a little tense - even though she is the one ahead. She's feeling a little pressure.

Definitely the wheels are coming off and she needs to reset.

Another loose hit from Gauff and Raducanu breaks back to love and bring us level at 4-4 in the second set. Game on!

Not a good game from Coco Gauff at all!

A double fault gives Emma Raducanu three break points!

Coco Gauff can put herself in a great position with another hold here, but a nervy start allows Emma Raducanu to turn up the heat.

A backhand winner down the line. 0-30...

Emma Raducanu keeps herself ahead despite pressure from Coco Gauff and holds to 30 after a forehand winner had pulled the American within range.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra

It must be difficult for Raducanu. She has a great return of serve but Gauff has so many options - the trajectory is constantly changing. She's keeping Raducanu guessing.

Emma Raducanu will continue to fight, despite any physical issues she is facing.

But she appears to hold her side in discomfort as Coco Gauff lands a forehand winner at the back of the court.

Emma Raducanu tries to apply pressure at 0-15 but loses the chance with a 30th unforced error.

There's no sign of Coco Gauff tightening up just yet, a couple of aces helping her to a comfortable game in the end.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra

Nice to see try Raducanu change it up, to try and unsettle Gauff. She is so good at changing direction.

She needs to keep Coco on her toes, to make her doubt herself.

That's really well worked by Raducanu, though!

She sends Gauff from side to side before the American is eventually forced into the net. The Briton hangs in there, sealing an important hold to remain in touch.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra

Raducanu must be a bit careful here that she doesn't drop her intensity. This could get away from her quickly.

Gauff will be right on to that.

There appears to be something wrong with Emma Raducanu's serve but it's not all that clear what that might be. She's struggling to dictate points in her games and Coco Gauff is full of confidence as she continues to attack the returns.