Bale has early chance saved
Return leg takes place next Wednesday
Repeat of last season's final
Ronaldo and Messi level on 75 CL goals
Red-and-white scarves as far as you can see at the Calderon as the stadium awaits the sides. Madrid is bang up for this. The home side will play at 110mph, can they overwhelm a ridiculously-talented Real side?
Agubata Odinaka: Man Utd Vs Liverpool is the biggest rivalry while Chelsea vs Arsenal is the most one sided rivalry in football history
We asked what result in a sporting rivalry have you enjoyed the most?
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I'd love it, love it if we had a goal as good as this tonight.
Twenty-four years ago today Paul Gascoigne scored an outrageous goal in the FA Cup semi-final.
Gareth Bale, Cristiano Ronaldo, Arda Turan - who can manage something similar tonight?
Kaushik Gorai: This game is all about Teamwork vs Individual Stars. And we all know which one had the upper hand in recent meetings.
The Romford Pele makes it in Madrid. Great scenes.
I'll tell you how loud it is the Calderon already - Roy Keane can't hear Paul Scholes standing next to him on ITV. He didn't have that problem when they were running the midfield together.
Daily Telegraph Football Correspondent Henry Winter on Twitter:, external Ray Parlour goal for #afc v Valencia in 2001 shown on big screen at Vicente Calderon
Image source, Henry Winter / TwitterCracking atmosphere at the Calderon as you'd expect, real fever pitch stuff.
You look at the sides tonight and Real Madrid's strength could well be their weakness. A front six of ridiculous attacking strength but not much in the way of defensive balance. Maybe Carlo Ancelotti is banking on an away goal or two...
Of course! The two Milan teams would have zero distance to travel. I seem to recall that they met in a semi-final a decade or so ago too.
Juve are the sole flag bearers for Serie A these days though.
Naren Ramachandran: What would be the shortest distance traveled by away fans Tom asks. What about Inter vs AC Milan? Home? Away?
Kevin Logan: Liverpool v Everton would be the shortest distance, wouldn't it?
Tonight's second Champions League quarter-final sees Juventus face surprise package Monaco - it's a case of what you could have won for Arsenal fans. Tonight. Will Monaco get their BFH? Or can the Ligue 1 side pull off another shock?
You can follow minute-by-minute updates on that game in a separate page - click here to follow action from Turin.
Two-and-a-half thousand Real fans will make one of the shortest 'away' trips possible in the Champions League this evening, turning a small section high in the gods white.
What would be the shortest possible distance I wonder? We'll have to wait for both Dundee clubs to qualify...
Real Madrid have not beaten Atletico in six meetings this season.
19 August, Spanish Super Cup
Real 1-1 Atletico
22 August, Spanish Super Cup
Atletico 1-0 Real
Image source, Getty Images13 September, La Liga
Real 1-2 Atletico
7 January, Copa del Rey
Atletico 2-0 Real
Image source, Getty Images15 January, Copa del Rey
Real 2-2 Atletico
Image source, Getty Images7 February, La Liga
Atletico 4-0 Real
He may not be involved tonight but Martin Odegaard will overcome his initial problems and be a Real Madrid success, says former boss Ronny Deila.
The Spaniards beat a host of clubs, including Celtic, to buy the Norway midfielder, 16, from Deila's former club, Stromsgodset, in January.
Image source, ReutersBut the teenager has been criticised for his displays with Real's B team, with his attitude also questioned.
"I think he in the future will be better and better," said Deila, suggesting there is no big problem.
"I can assure you that he has no attitude problem. That's 100% certain."
Reports in Spain have suggested that Odegaard, who cost Real more than £2m, has insisted on training with Real's first team instead of Castilla, who play in the third tier, Segunda Division B.
rishabh kapoor: When you had Roy Keane & Patrick Vieira on the pitch you knew it was gonna be some match. Same could said about Nadal & Federer
Image source, PAvaishnav: I would like to say that Real Madrid vs Barcelona, the el clasico is the biggest rivalry in sports
Shane Daly: I think Real are set up to try win this game, I think, I could be wrong
We asked what result in a sporting rivalry have you enjoyed the most? Get in touch at #bbcfootball, external, pop on to the BBC Sport Facebook page, external or BBC Sport's Google+ area., external
You can also text us on 81111 in the UK only - don't forget to say who you are and where you are texting from.
Atletico Madrid captain Gabi and fellow midfielder Mario Suarez are both one booking away from suspension while Real duo Toni Kroos and Marcelo are also on the tightrope. There will be bookings tonight. I guarantee it.
Ref Milorad Mazic could be a busy boy.
Andy West
European football writer
"One of the specific tactical keys to Atletico's recent dominance over Real is their ability to exploit their attacking strength and Real's defensive weakness: width.
Image source, PA"All four of Atletico's goals against Real in February came from crosses - three from the right wing, where deceptively skilful right-back Juanfran regularly surges forward to showcase his outstanding crossing ability.
"Los Rojiblancos are especially dangerous when they play against Real because of Carlo Ancelotti's 4-3-3 formation. That allows Gareth Bale and especially Cristiano Ronaldo to be largely absolved of defensive duties and frequently leaves full-backs Marcelo and Dani Carvajal outnumbered."
There are 10 Championship games this evening as the wheat continues to be separated from the chaff at the tail end of the Football league thresher.
Seven of the top eight are in action, while in the lower leagues Bristol City and Shrewsbury can win promotion this evening.
Spanish football writer Graham Hunter on Twitter:, external Advantage #Atleti in the Champions League derbi - Pepe out and Varane in is not a plus for #Madrid
Real Madrid have won just one of the last eight meetings with Atletico.
An extraordinary run of form from Diego Simeone's side - but what result in a sporting rivalry have you enjoyed the most?
Image source, Getty ImagesFinally seeing England win the 2005 Ashes after a 19-year wait? Lennox Lewis getting the better of Mike Tyson? Jonny Wilkinson drop-kicking England to World Cup glory in the Aussies' back yard? Or Leon McKenzie guiding Norwich to a win over Ipswich?
Let me know. The more elaborate, the better.
Get in touch at #bbcfootball, external, pop on to the BBC Sport Facebook page, external or BBC Sport's Google+ area., external
You can also text us on 81111 in the UK only - don't forget to say who you are and where you are texting from.
Of all the squares in Madrid, Real's fans choose that one? Come on lads.