This could be a big save for Navarro.

Four times Haddad Maia had the chance to break and four times Navarro fends it off before this time making the hold stick, helped by a forehand smash as her opponent attempted the lob with Navarro at the net.

Haddad Maia gives herself some words of encouragement after letting slip break point on three occasions.

Fourth time lucky? No as she sends a shot into the net. Deuce once more.

A good battle at the net at 15-15 is won by Haddad Maia as she clips her return out of Navarro's reach before fist pumping the air as she leads 30-15.

But Navarro fights back, once again taking the honours in a lengthy rally that ends when Haddad Maia's shot is just out.

It is 40-30 but Navarro's return from the back of court hits the net to open the door for a potential break for Haddad Maia.

The camera cuts to the crowd as we have a short break here and clocks a couple, one wearing what looks like a lampshade as a hat and the other wearing a cap saying "I was there".

Fascinated now to know where "there" was.

We remain on serve as a second ace of the match helps Haddad Maia to hold.

Navarro's best opportunities come when she can engage her opponent in rallies, but that's proving difficult when Haddad Maia's serving is as strong as it has been.

Navarro kicks this game off with a good winner at the net, before Haddad Maia's forehand goes wide.

The American then plants a return right into the corner to lead 40-0 before a decent rally ends with Haddad Maia's backhand hitting the net.

A strong hold by Navarro to boost her confidence once more.

Haddad Maia is back in control as she holds to lead 3-2.

She's cut out some of the mistakes she was making earlier and produced some nice shots in this game, the highlights being a cross-court winner at the net and then a neat forehand down the line to seal it.

The seats are slowly starting to fill around Centre Court as more fans arrive to watch the action.

But it is frustration for Navarro as she undoes all that good work in this fourth game as Haddad Maia breaks back.

Mistakes are once again creeping into Navarro's game with too many of her shots going long or finding the net.

A good response by Haddad Maia as she stalls Navarro's momentum to get off the mark in this second set, helped by a first ace of this match by either player.

Big cheers from a sizeable portion of the crowd as Haddad Maia sweeps a forehand return into the net and Navarro holds.

A big, big game for the American as she looks to swing the momentum her way.

This is much more even now as the pair fight to deuce in the second game of this second set.

Navarro slaps her side as she sends a return into the net and it is advantage Haddad Maia, and a swift break back is on the cards.

But Haddad Maia sweeps a shot wide and then sees a lob drop just the wrong side of the white line.

Now it is Navarro's chance to take the game but she double faults and we are back to deuce.

A proper battle now. How this one goes could be crucial to shaping the course of this match.

"Come on Emma" shout some of the spectators as the second set gets under way.

It looks like being more of the same as Haddad Maia races 40-0 ahead but suddenly there's mistakes creeping into her game while Navarro is finding her rhythm.

The American fights back to deuce before taking the next two points for her first break of the contest.

A devastatingly comfortable first set for Haddad Maia.

The Brazilian is very much on her game but Navarro is not looking on it as she sends a return wide to typify her performance so far and hand the opener to her opponent.

It is going to take some turnaround from the number three seed to stop Haddad Maia.

Three match points saved but eventually Katie Boulter and Emma Raducanu succumbed to the experience of the top seeds.

They will both put their full focus on their respective singles matches tomorrow.

Boulter and Raducanu save the first two match points then wipe out the third when Routliffe's shot drops wide!

Too good from Routliffe at the net and Kichenok and Routliffe have three match points.

Routliffe holds her hand up in apology as her shot at the net pings off Boulter and drops for a 0-15 lead.

That's twice something like that has happened between those two!

Haddad Maia holds on her serve to lead 4-0 and Navarro is in danger of losing the first set without winning a game.

But she digs deep on her serve and a delicate slice at the net draws encouraging applause from the crowd.

That does her confidence the world of good as she goes on to get off the mark and win the fifth game of this contest.

Long way to go, but something for Navarro to build on.

Routliffe is absolutely stunned after what she thought was a pinpoint accurate serve is called out.

Raducanu twice hits into the net then hangs in the rally at 40-30 brilliantly but has no reply to Routliffe's shot to the back corner.

Can the pair hold here to earn themselves a tie-break?