Martin Klizan quite fancies these delicate drop shots. He's outfoxed Djokovic with another one for 30-15.

The Slovakian goes on to hold.

*denotes next server

Image source, PA

Our first ace of the match, courtesty of Mr Djokovic, brings the world number four up to 30-15.

He reckons he's landed another to take the game, but Klizan makes a late challenge and he's right - it was quite a long way out.

The replayed point goes Novak's way, anyway.

Prior to Wimbledon, Martin Klizan was forced to retire with a calf injury in Antalya.

But he looks pretty sprightly early doors here. He holds his opening service game with ease.

David Ferrer is through to the second round after victory over 22nd seed Richard Gasquet on court 12.

Ferrer registered a 6-3 6-4 5-7 6-2 win over Gasquet, winning 133 points compared to Gasquet's 117.

Here's the winning moment.

Novak Djokovic gets his Wimbledon 2017 campaign under way and overpowers Martin Klizan with a big serve for 40-0.

But he shanks a forehand and then gets mugged off by a delicate touch over the net from Klizan and it's 40-30.

And then deuce, after a double fault. Oh dear.

The three-time champion finally composes himself to hold. Djokovic made that more difficult than it should have been.

Image source, EPA

Former champion John McEnroe is being interviewed on BBC One and has become the target of Novak Djokovic's serving practice.

One man seems to be enjoying it more than the other.

Anyway, enough messing around. Time for another match on Centre Court.

Katie Boulter is out on court 12 against Christina McHale.

Boulter is another Briton who has had a tough ride in the past 18 months.

She struggled with injury and illness during 2015 and 2016 but she broke into the world's top 300 ths year, and recieved a wildcard into the Wimbledon singles and doubles.

Coached by her mum as a youngster, Boulter has risen to 235th in the world, with two ITF singles titles to her name

"Even though mums not my coach now she's definitely my number one fan and will be supporting me next week.," Boulter told the Daily Telegraph., external

“Looking back on it, I'm really not sure how we did it, but it was very much a family effort. My mum would drive me to practice before or after school and my grandpa Brian would drive me across the country from match to match at the weekends.”

Image source, Getty Images

Three-time champion Novak Djokovic and Martin Klizan make their way on to the green green grass of Centre Court.

This is the fourth meeting between the pair - but their first at a Grand Slam - and Djokovic is unbeaten against the Slovakian.

Klizan is left-handed, like one of the live texters on here (Caroline). Solidarity, brother.

Del Potro takes the first point but a mighty response from Kokkinakis to set up a smash winner for 15-15.

A 128mph ace down the middle and Delpo has 30-15.

Another big serve out wide, the Aussie can't return and Del Potro has two match points.

What a way to save one! Kokkinakis ripping a cross-court winner.

Still match point, though. First serve, net. Second serve, backhand rally...Del Potro goes long. Does he? He's having a look but that is indeed long. Two match points saved by Kokkinakis.

Oh what a terrific ace out wide! Third match point. No charm though as Delpo hits the net and we're back to deuce.

Big serve strikes again! Kokkinakis skies his return long. Match point four...

No! Brave from Kokkinakis as he forces Delpo back and the Argentinian slices into the net.

This is going into a second entry...

Angelique Kerber speaking to BBC Sport after her 6-4 6-4 win: "All the memories from last year came back. It was amazing what I played last year. I was trying to focus on this match. I'm happy to be back.

"This year is a completely different year for me. I'm looking forward to playing my next matches. I'm happy I'm through the first round. I'm just looking round by round.

"She had nothing to lose and I think she played good. It's always good to have a tough match in the first round."

Boris Becker
Three-time Wimbledon champion on BBC TV

I call Djokovic a physical freak of nature. Most people would get injured the way he slides across the court but he just gets up and goes again because he does so much stretching and hard physical labour. This is an important tournament for him to decide how 2017 is for him, if he loses in the quarter-finals then the time is running him out for him to make this a good year. He needs this tournament.

Coming up after Kerber v Falconi on Centre Court is this wiry fella.

Three-time champion Novak Djokovic endured a difficult Wimbledon campaign last year, going out in the third round against Sam Querrey, and it's been a bit of a rollercoaster ever since.

He was runner-up to Stan Wawrinka at the US Open, bowed out in Australia in the second round, and made the quarter-finals in France.

But the world number four went a long way to proving he's back on track by lifting the Eastbourne trophy last week.

His first round opponent today is Slovakian world number 47 Martin Klizan, who has never got past the second round at the All England Club.

Image source, Getty Images

See the highlights from the match between Britain's Kyle Edmund and Alexander Ward.

Kerber plays it safe, winning a brief encounter at the net, before forcing Falconi's forehand to go askew.

Three match points...

Wild from Kokkinakis as his would-be winner is well wide.

More good serving sets up a leveller but a loose backhand makes it 15-30 to Delpo.

Shot! A more measured approach sees the Aussie up at the net and deftly volleying for 30-30.

Belting return from Del Potro and Kokkinakis can't counter. Break point for the Argentinian.

A decent return sees the Aussie slice into the net and Delpo will serve for the match.

Milos Raonic, Wimbledon's resident Clark Kent lookalike, has breezed through the second set against Jan-Lennard Struff of Germany.

The sixth seed and 2016 runner-up leads 7-6 6-2 on Court One. Here are the stats, and don't forget you can watch online here.

Martina Navratilova
Nine-time Wimbledon singles champion on BBC TV

Falconi is playing some inspiring tennis and Kerber will be desperate to win this game to be able to serve for the match and get off the court quickly.

Falconi is still pushing and drawing the errors out of Kerber. This time it's a floaty backhand that drifts out of play.

A double fault hands Kerber two break points, but she slaps her first into the net to take it to 30-40.

That's wide from Falconi, though, her hands moving too quickly - and Kerber will serve for the match.