A warm pat on the back by Roger Federer for Marin Cilic after the Swiss wins the toss and elects to receive first.

Hushed silence during the coin flip, followed by a fevered flurry of chatter. Time for a knock up and then away we will go...

Chris Bevan
BBC Sport at Wimbledon

Image source, BBC Sport

Good luck to anyone hoping for a quiet lie down on Henman Hill today. Not a spare patch of grass in sight.

Not much doubt about who most of them are supporting, either. "Come on Rogggggerrrrr" goes the cry as Federer strides into view on the big screen.

Anna Thompson
BBC Sport at Wimbledon

A veritable Royal Box for a special occasion with the Duke and Duchess of Cambridge leading the British royals and Prince of Albert of Monaco is here too.

Showbiz royalty includes Hollywood A-listers Bradley Cooper and Eddie Redmayne, who were having a lively chat as they made their way to their seats, as well as Hugh Grant and golfer Justin Rose.

Former Wimbledon champions grace the padded seats as well, including Stefan Edberg, Chris Evert, Rod Laver and Stan Smith.

Image source, Reuters

Image source, Getty Images

Here they are! A standing ovation for both players as they stroll out onto Centre. Not a spare green seat in the house.

Federer marches out to the net first for the coin toss, Cilic making him wait as he unwraps a box-fresh racquet.

Don't think that will get into his head Marin...

Roger Federer appears a few seconds later. Would it surprise you to learn he looks super-chilled? Thought not. As cool as cucumber left in the fridge for a fortnight.

It's a long walk from the locker room to the grass. Lots of thinking time...

Boris Becker
Three-time Wimbledon champion on BBC TV

I remember what it was like when I was 17 and 18. You're getting nerves and excitement before you walk out.

Marin Cilic is pacing about in the corridor outside the locker room, fiddling with the sleeves of his pristine white tracksuit top. The Croatian looks like he is just about to give a best man's speech. Nervy.

Image source, BBC Sport

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Huge cheers from the packed Centre Court crowd. Have the players arrived early? Nope, the whoops are for the ball boys marching out.

Nearly time! You've got five minutes to finish making your lunch/washing the dog/whatever you're doing. It can wait. This is more important.

Marin Cilic's coach Jonas Bjorkman has been talking to BBC One, he says his player is "feeling great" ahead of his meeting with Roger Federer.

"He's a great player from the start, we've just adjusted a few things," said Bjorkman. "We've worked to get him more aggressive and on his body language.

"He had his best clay court season ever and the preparation coming into Wimbledon was really good.

"Marin has the strength and knows what it takes to win a Grand Slam."

Estella Joyce: I saw Roger Federer at the Australian Open in 2002. I had no idea then just how great he would become

John McEnroe
Three-time Wimbledon singles champion on BBC TV

Former coach Goran Ivanisevic made Cilic much more of believer, a battler and much tougher.

When they broke up, Marin was a bit lost. From early in the year to mid-May Cilic had a losing record. New coach Jonas Bjorkman he's tapped into and it's looking good for him.

Goran Ivanisevic may no longer be Marin Cilic's coach, but the Croatian seventh seed might still have picked up the blower to his idol ahead of his first Wimbledon final.

Why? Because Goran knows all about losing a Wimbledon final. Three times.

"He has to enjoy the moment. He is in the final of the biggest tennis tournament," says Ivanisevic, who was beaten in 1992, 1994 and 1998 before finaly winning in 2001.

"You don't want to lose in the final of Wimbledon - trust me.

"You get a nice looking plate but it is a huge difference. I know - no-one cares.

"When you win the tournament the whole world knows."

Image source, Getty Images

You don't want to get sweaty towels mixed up...

Image source, PA

So how does Marin Cilic beat Roger Federer? Luckily Tim Henman - the former British number one and a four-time Wimbledon semi-finalist - tells us how he MIGHT have a chance.

"Federer is the favourite but Cilic definitely has a chance," he says.

"To put it into context, I would say if they played 10 times I think Cilic could win twice - well, maybe two and a half times."

Read Tim's full analysis here.

Marin Cilic knows how to beat Roger Federer on the biggest stage, having won against the Swiss on his way to US Open succes in 2014.

The problem is that was the only time he has triumphed against the Swiss maestro.

Federer has won six of their seven meetings since 2008, including that epic quarter-final last year.

Cilic led by two sets to love and had three match points in the fourth set, before Federer fought back to win in five sets.

Hands up if you remember this? Come on, it was only 12 months ago...

Tim Henman
Former British number one on BBC TV

The reality is when you talk about the match up, Roger is not going to lose it, Cilic has to win it.

Roger's experience in Grand Slam finals is brilliant. Cilic has nothing to lose - he has to swing away and see if he can cause that upset.

Those who follow BBC Sport on Facebook may have seen Rufus the Hawk - the bird of prey who swoops on any unwanted visitors on the Centre Court turf - turn into tennis's Paul the Octopus and pick out Roger Federer as his predicted champion.

Does Rufus know his stuff? Or can Cilic cause an upset? Let us know what you think will happen today. Tweet #bbctennis or text 81111.