Right then.

The big return begins. But Murray steps out of the limelight to start with, Herbert will serve first.

Image source, Getty Images

Peter Fleming
Seven-time Grand Slam doubles champion

I'm looking forward to it. Having watched two or three of his doubles matches at Queen's you know Andy will play well but it is how he will combine with Pierre-Hugues Herbert, a great doubles player.

Justin Fairweather: Kyrgios' biggest challenge is Kyrgios. Seriously good, pure emotion. What a match this is.

Orry Jardine: This Kyrgios/Nadal match is spicy, cracking match so far

Kassim Patel: Fireworks going off between Nadal and Kyrgios at Wimbledon! Is there enough stewards for after the game?

Rafael Nadal takes the opening point with a superb running forehand. 0-15.

Kyrgios with a lovely slipper-soft dropper and a whipped forehand moves to 30-15.

Another net volley and it is 40-15.

An ace and the game is cooked.

Where is the mojo and momentum in this one? It is like trying to pin down molten mercury. We are right at the pivot point with the match in the balance...

You can watch it right here.

Image source, AFP

"I'm just happy to be playing tennis again," Murray, whose last appearance at SW19 came in his 2017 quarter-final defeat by Sam Querrey, said.

"I play to win. I'm really competitive. But I didn't know four or five weeks ago if I'd even be playing over the grass so I shouldn't be expecting too much.

"But once I step on the court, I'll be out there trying to win every match I play."

This is not Murray’s first foray into doubles since his operation.

The two-time Wimbledon singles champion made his competitive return at Queen’s. You might have thought Murray was just having a go at doubles to see how his hip would hold up.

But Andy Murray doesn’t just ‘have a go’. His will to win looked just as strong as ever as he and Spain’s Feliciano Lopez won the title.

Image source, Getty Images

Nick Mullins
BBC Sport commentator at Wimbledon

Look at Nadal's reaction.

You don't see that much from him midway through a second round match at Wimbledon...

Boris Becker
Three-time Wimbledon champion on BBC TV

The matador sees red.

If there's one player I don't want to get rattled and get really emotional is Rafael Nadal.

I've seen Federer, I've seen Djokovic, but it's this guy you've got to be careful with.

Image source, Reuters

Rafael Nadal celebrates as Nick Kyrgios misses wide.

When the Australian knocks long to concede the game, he goes full loco.

Whipping around to scream in celebration to his players box, exhorting more decibels from the crowd and whipping the atmosphere up to eleven.

Nick Kyrgios serves to stay in the set next. Which is no coincidence...

In the men’s doubles today, Murray is partnering France’s Pierre-Hugues Herbert against Frenchman Ugo Humbert and Romanian Marius Copil.

Herbert is a good choice. He’s a doubles expert who has won all four Grand Slam titles in the men’s event.

He’s gone for a slightly more high-profile name in the mixed doubles – Serena Williams. You might have heard of her.

When Murray broke down in tears at an Australian Open news conference in January, many thought his tennis career had come to an end.

He had a hip resurfacing operation and still it seemed the road back to the All England Club might be a bit too long.

But he’s made it and will be playing in not one, but two events.

Serena Williams said after her win: "I thought she played well. She returned well, I couldn't really ace her because she was reading the returns.

"I started out a little slow. I like the pressure. I'd rather be in this position than any other. I play best when I'm down sometimes. I'm just a fighter and I never give up."

On teaming up with Andy Murray for the mixed doubles: "I'm practising every day. I played a little doubles yesterday. I'm excited to play with a British icon like Andy. It's going to be amazing. Maybe I can learn a thing or two, I'm always open."

Here we go. Everybody loves a comeback gig (e.g. when Robbie reunited with Take That in 2011 - #NeverForget) and now it’s time for Andy Murray’s big one at SW19.

The former world number one provided many people’s favourite ever Wimbledon moment when he won his first title here in 2013.

He missed last year’s tournament with a hip injury and now, one surgery later, he’s just stepped back out on Court One for the men’s doubles to a huge roar from the crowd.

Image source, Getty Images

Nick Kyrgios friends and connections in his players box are sporting baseball caps with an endearing home-made looking monogram 'NK' logo on them.

The sort of thing that wouldn't get past the first stage of a Roger Federer marketing brainstorm.

Nadal to 40-15 and then incident!

Kyrgios clubs a forehand straight at Nadal as he comes to the net. It was aimed right at his ribs. The Spaniard defends himself with his racquet, loses the point and shoots daggered looks down the court.

A double fault from the rattled Rafa.

Deuce.

These are the match stats from that Serena Williams win.

Image source, .

Nick Kyrgios' pancake flat backhand down the line moves him onto 40-15.

A wrong-footing ace follows to seal the game.

Rafa not laying more than a pinky on his service games at the moment.

Who blinks first?

Great celebrations on Court One. The reason? They've just been told they get to witness a bonus match.

Just a certain men's doubles match.

Involving a certain Andy Murray.

Image source, PA Media

Chanda Rubin
American former world number six at Wimbledon

Serena once again tested and must have been taken off guard with the way Juvan played in that first set. In the end, it was Serena playing better as the match went on and raising her level.

Genie Bouchard is in Nick Kyrgios' players box. Make of this what you will.