Amy Lofthouse
BBC Sport at Wimbledon

Quite the contrast when either player makes an error.

Sabalenka berates herself or her team. Osaka, after she hoicked that volley into the net, immediately turned her back on the ball and jogged back to the baseline, heels kicking up. Much more positive.

Hold the front page... we have a break of serve!

It's taken two hours and 50 minutes, but it's Felix Auger-Aliassime who makes the breakthrough as he takes advantage of an Alejandro Davidovich Fokina second serve to hammer a forehand return winner down the line.

That's brought the Court One crowd to life.

Image source, Getty Images

Naomi Osaka draws Aryna Sabalenka to the net and is waiting to slam a volley winner but gets it horribly wrong.

That would have taken her to 30-30 and handed her a sniff of breaking but Sabalenka wraps up the hold on the next point.

Sam Smith
Former British number one on BBC One

Historically, Naomi Osaka has always been a fabulous frontrunner. This year, she has won 19 out of 20 matches when she has won the first set.

The only match she has lost from being a set up was against her opponent today, Aryna Sabalenka, in Madrid after winning the first set on a tie-breaker.

Image source, EPA

Amy Lofthouse
BBC Sport at Wimbledon

Naomi Osaka has returned serve very, very well, and Aryna Sabalenka hasn’t. That’s been the difference so far.

It is also not cooling down much despite the sun starting to dip. It is humid.

There isn't too much to say about Felix Auger-Aliassime and Alejandro Davidovich Fokina other than the pair are continuing to serve incredibly well.

We're over two hours and 45 minutes in and we're still waiting for the first break of serve.

In fact, Canadian third seed Auger-Aliassime is still yet to be broken in this entire tournament.

He faced a couple of break points in that last game but rose to the occasion again.

Naomi Osaka is looking so strong when serving.

A hold to love means she has only dropped one point on serve across three games in this second set.

Tracy Austin
Two-time Grand Slam champion on BBC One

This is a surface Naomi Osaka wasn't comfortable on for a long time, but I can admire someone who takes the challenge on.

She didn't take it, but that was phenomenal returning. Those weren't just powder puff serves and she wasn't just getting her returns back in play, they were to the sideline with pace.

Image source, Getty Images

On court two, Poland's Hubert Hurkacz has just gone two sets up against veteran German Jan-Lennard Struff in the men's singles.

The former world number six won the first set 6-3 and has taken the second after a tie-break.

Meanwhile in the mixed doubles, sixth seeds Britain's Neal Skupski and his American partner Desirae Krawczyk are level at one set apiece with Francisco Cabral of Portugal and Australia's Ellen Perez on court 12.

Two-time Wimbledon champions Skupski and Krawczyk won the first set on a tie-break but lost the second 6-4.

On court 18, Briton Joe Salisbury and Canada's Leylah Fernandez have just beaten the all-British team of Ben Jones and Maia Lumsden, winning 6-4 4-6 6-2.

Naomi Osaka has been so accurate from mid-court but struggles to come up with the goods this time when finding the net.

A big Aryna Sabalenka serve also proves tough to deal with and Osaka sends long.

That was a huge hold for Sabalenka.

Lovely set up play from Aryna Sabalenka on second serve to get to fourth deuce.

Sabalenka pops the ball up and then steps up the court to slam away a winner.

Image source, Getty Images

Aryna Sabalenka defends for third deuce but then gets her feet tangled on the baseline and crashes a forehand into the net.

Such a key moment in this match.

Wonderful disguise from Naomi Osaka.

The 10th seed shapes to fire a forehand down the line but changes at the last moment to whip a cross-court winner.

Tracy Austin
Two-time Grand Slam champion on BBC One

When you're receiving a slow ball, you really shouldn't be jumping like that. To me that shows Aryna Sabalenka wasn't alert with her footwork.

When you watch Naomi Osaka, her footwork right before she receives is impeccable. She is incredible at taking lots of little steps to get in the right place.

Aryna Sabalenka steps up to the net and should take the point with a volley put it's not hit with great purpose. Naomi Osaka gets the return back by Sabalenka is there at the net to volley the winner at the second attempt.

Now it's Naomi Osaka stepping up the court. The Japanese has looked really good when she's taken on that approach.

There's a look of resignation on Aryna Sabalenka's face when Naomi Osaka puts a winner into the corner. Sabalenka throws down her arms and looks up to the sky as if to think 'what can I do here?'

Sabalenka gets to 40-30 but snatches at a forehand.

Image source, PA Media

Tracy Austin
Two-time Grand Slam champion on BBC One

I always think the coach's job is to give the player the pieces of the puzzle they needed to think about or work on in practice.

On that, I feel like Naomi Osaka's transition game has improved so much.

Naomi Osaka comes up with a 116mph first serve to send Aryna Sabalenka wide before slamming away a winner into the opposite corner. Lovely set-up play from the 10th seed.

Osaka switches it up with a big serve on the T and Sabalenka's racquet sends the return wide.

Image source, Getty Images

Amy Lofthouse
BBC Sport at Wimbledon

At 0-30 down, Aryna Sabalenka whacked her head with her racquet about half a dozen times, and then won the next four points to hold.

I don’t recommend it as a tactic but it might have just freed her up a little bit.

Aryna Sabalenka is too flat with her backhand return and falls 15-0 behind on serve.

On no. Sabalenka starts hitting her racquet strings on the side of her head as she trails 30-0. This isn't looking good.

A switch of emotion from Sabalenka as she cheers in delight when levelling at 30-30. A big serve wide puts Osaka under pressure and the Japanese can only return wide.

That game was a real rollercoaster for the top seed.