It's, er, all ova in the ova derby.

Russa's Ekaterina Makarova has gone marching on to the last 16, beating Czech Lucie Safarova 4-6 6-4 6-1.

You may remember Makarova knocked out Australian Open champion Caroline Wozniacki in the second round, after which Woz said she didn't think Makarova would go far in the tournament.

Well, she's into the second week...

Gael Monfils is down...

A nasty slip from the Frenchman as he buckles like a baby elephant on ice beyond the baseline and almost does the splits.

He's already got a heavily strapped knee, but looks to be feeling the inside of his left hip?

Talking of baby elephants, my mum used to say "you're like a baby elephant coming down those stairs..." but that's a common misconception, baby elephants are actually pretty stealth-like.

Anyway, Monfils is having some treatment out on Centre Court. And now he'll take a medical time out.

Image source, PA

Another roar from the seriously pumped Alexander Zverev. He's got the break in the fifth set.

Fritz's racquet takes a tumble to the turf.

Image source, PA

Big danger for Taylor Fritz. He shanks a forehand on his way to giving Alex Zverev two more break points.

Yet another break of serve as Madison Keys is broken. That's four games on the bounce now that neither player has been able to hold on court three. Could it prove pivotal this time with Evgeniya Rodina serving for the match?

This one could be heading to a tie-break. Neither Kevin Anderson or Philipp Kohslchreiber have looked like breaking serve in the third.

Alexander Zverev really does give the ball some whack. I'd be worried if I was sat in the front row on Court One. He's surely going to win a Slam one day, isn't he? The German is fun to watch too. A cry of "come on" greets a backhand winner after a little bit of pressure was put on by Fritz.

Zverev levels it up in the fifth set.

Back on serve on court three. At the fourth time of asking Madison Keys converts a break point with a beautiful cross-court winner. Her Russian opponent not quite moving as freely around the court now.

Gael Monfils yanks a wild forehand long. Sam Querrey takes the first set in 37 minutes.

Brilliant exchange.

Sam Querrey and Gael Monfils trade slices at the net before Monfils clips the tape and the American slaps a flat forehand into the space. Like a game of beach tennis.

Big chance for Querrey... two set points.

Sam Querrey is cracking them down now, but eventually Gael Monfils engages the American and slings in a drop shot that almost boomerangs back towards him after bouncing just over the net - magnificent.

It's the only blemish on the Querrey service game, though.

John Lloyd
Former GB Davis Cup captainFe

Fritz needed that. Almost like he needed to do some more sprints or work up a sweat up. He looked cold in the fourth set

Twice now I've almost typed Taylor Swift instead of Taylor Fritz.

The American is in trouble on Court One. See what I did there?

He's break point down but this time the big first serve returns at the perfect time to help him through against the heavy-serving German Alexander Zverev.

Fritz has halted Zverev's momentum at least. A hold to start the decider.

Great stuff from Madison Keys as she breaks back to level up the match at 3-3. But in the following game Keys then surrenders her own serve. The American slumps down on her haunches after striking the ball low into the net.

Sam Querrey steams through a quick hold and now Gael Monfils finds himself serving to stay in the first set.

The Parisian loses the first point, but gets Querrey on the run with a wide serve and skips into the net to volley beyond the giant American's reach.

A good hold.

Jonathan Jurejko
BBC Sport at Wimbledon

Excuse the poor photography but it's quite difficult to switch your phone from the recording device to the camera in the split second that a 12-time Grand Slam champion strides towards you.

While I was grabbing a quick word with Kyle Edmund's coach Fredrik Rosengren about plotting Djokovic's downfall tomorrow, the man himself appeared from behind us.

They shared a friendly hug and 'How are you?' on the practice courts before the even more serious business begins tomorrow.

Image source, BBC Sport

(I promise that is a partially-blocked Novak.)

Gael Monfils finds a tad of composure and saves the break point with some pin-point serving to the Sam Querrey forehand, before rattling to a hold.

Image source, PA

This first set is yet to really come to life, but Gael Monfils decides otherwise and offers Sam Querrey a chance with a pair of double faults.

It's almost like he's making it interesting for himself, punching a backhand from behind the baseline long for deuce.

Those errors could be costly. Another wraps the net and it's break point Querrey.

A few more big aces and a few more misses from American Taylor Fritz. In a flash the fourth set is done and dusted.

Zverev has come out of the blocks like a 100m sprinter this morning. Fritz is trundling along like a steeplechaser and looks like he might stumble into the water hazard.