That is one patriotic American family celebrating Independence Day.

Chanda Rubin
American former world number six at Wimbledon

This is one of the big strengths and advantages that Serena has. She expects to win these types of matches. It's just an innate belief. And on the other side of the net Juvan can say she's done well, played a good match and hasn't embarrassed herself. That's the challenge, does she have that belief and will to keep battling?

Image source, Reuters

Juvan saves one break point but the first serve on the second is no good. That means Williams can inch forward for the second serve and the return is met by an attempted backhand down the line from Juvan.

The angles are all wrong though, it is just out, Williams breaks and that could be the beginning of the end for the Slovenian.

It's been a busy afternoon with lots of cracking stories:

• Johanna Konta shows top form to win in straight sets
• Roger Federer outclasses GB's Jay Clarke in three sets
• Lucky loser Lauren Davis shocks defending champion Angelique Kerber
• Serena Williams loses first set to 18-year-old Kaja Juvan
• Nick Kyrgios serves underarm - twice - against rival Rafael Nadal

Todd Woodbridge
Former Wimbledon doubles winner on BBC TV

On whether Nick Kyrgios should get a coach...

It will help when he's ready to listen and take the messages on board.

But until then, there's no point.

Nick Kyrgios to 40-0 in a blink of an eye via one superb drop-shot/lob one-two punch and two aces.

Rafael Nadal nicks a point back as Kyrgios, reveling in his cushion, bunts long.

But another ace out of the quiver and it is a done deal.

Is the Juvan resistance coming to an end? Two break points for Williams.

Serena Williams loses the first point of game four, but then produces a masterclass of serving with Juvan struggling to get a racquet on it. Still, we're at 2-2.

Image source, Reuters

Pinpoint serving from Rafael Nadal delivers a service hold to love.

Nick Kyrgios gives it a little clap of palm on string. Truce? It won't last.

This is how we're level on Court One...

Even the changeovers are engrossing.

Nick Kyrgios has another little nibble at the umpire over Rafa's slow play.

He then jumps up and stands on the baseline, twirling his racquet in his hand like a majorette while Nadal finishes toweling down.

Nadal gets a little bit of bird from the crowd now. Is he now trolling Kyrgios deliberately? He fires back in Spanish and jogs to the baseline and we are ready to play...

Image source, Reuters

Chanda Rubin
American former world number six at Wimbledon

There's still a way for Juvan to go but who would have thought she would even be in this position when she took the court against Serena?

An excellent hold from Kaja Juvan. She had to dig deep but she saved two break points and we remain on serve in the decider.

Image source, EPA

This is the sort of chirrup level that the Australian cricket team, pre-sandpapergate, would be proud of.

Nick Kyrgios celebrates 30-0 with a strange sort of crabbing dance in front of the net. Rafael Nadal has long since stopped looking at him.

Kyrgios celebrates 40-0 with a hop and a skip.

He tries to seal the game with a round-the-back volley. Fails. But it only delays him one point.

Nadal bumps long and the second set is the Australian's...

Juvan gets a bit lucky. She saves one break point and has to then repeat the trick, she does, just about, aided by a helpful net cord. Deuce.

The Duchess of Sussex, Meghan Markle, is watching the action on Court One.

A show of royal support for best mate Serena.

Image source, PA Media

Chanda Rubin
American former world number six at Wimbledon

It is the sustained pressure that Serena is putting on Juvan. Juvan is certainly feeling it.

This is crucial. Break point for Serena Williams.

Alex Haworth: Kyrgios has a point, but he has also lost the plot.

Stuart Ritchie: It’s ridiculous for people to boo Kyrgios for underarm serves. Nadal once again getting away with time wasting when other players would be penalised for same thing.

Charlene Beedie: I don't understand it all and I certainly don't like it.....Kyrgios needs to grow up and have some respect for the sport and the players and the officials.

George Manchester: Nick Kyrigos is box office and good for tennis and he’s right when it’s his serve and he’s in the motion why should he have to wait for Rafa..

Rich: Yes Nadal's slow, but that doesn't give Kyrgios a free pass to act like a petulant little child. Trying to demean and belittle the umpire is not going to get him on your side. And he tries it every single match.

A player that certainly splits opinion...