Continue reading below for bundesliga.com's LIVE blow-by-blow account of the evening's action...
Dortmund: Weidenfeller - Subotic, Hummels, Piszczek (Großkreutz 83'), Schmelzer - Bender, Gündogan (Schieber 90') - Götze, Reus, Błaszczykowski (Kehl 82') - Lewandowski.
Real Madrid: Diego Lopez, Varane, Pepe, Ramos, Coentrão, Khedira, Özil, Alonso (Kaka 80'), Modrić (Di Maria 68'), Ronaldo, Higuaín (Benzema 68').
|Lewandowski 8', 50', 55', 67'|
|Possession||47 %||53 %|
That brings an end to our live coverage of this evening's UEFA Champions League semi-final first leg. Just like Bayern yesterday, Dortmund have put themselves in a fantastic position to reach the final. Roll on next week!
Thanks for joining us and stay tuned on bundesliga.com for a full match report and all the best pictures, as well as all the reaction and analysis to tonight's gam
bundesliga.com Reporter at the Signal Iduna Park: "I'm ecstatic and incredibly proud! What an amazing evening. First the mircale against Malaga and now this gala against Real. Unbelievable!"
FULL TIME: Whisper it: it's looking good for an all-German final right now. What an incredible couple of days for the Bundesliga's representatives!
FULL TIME: The referee blows his whistle, bringing a truly sensational game to an end. Real were blown away by Dortmund's intensity in the first 20 minutes of the second half and had no reply!
90 +2' Dangerous corner from Real. The ball lands in the box but Varane snatches his shot wide.
89' The fourth official indicates that four minutes of additional time will be played.
bundesliga.com Reporter at the Signal Iduna Park: "Amazing atmosphere here! The entire south stand is singing the club's song - it's giving me goosebumps! Only a few more seconds now and Dortmund are all but on the way to Wembley!"
87'Dortmund are keeping it tight at the back, patiently playing the ball around to run down the clock. Real are starting to look desperate, hitting hopeful long balls forward.
84'Klopp is looking to sure things up at the back, bringing on defensive midfielder Sebastian Kehl for the more attack-minded Piszczek and Kevin Großkreutz for marauding right-back Piszczek.
79'Real are pushing now, knowing that it'll be tough to put three goals past Dortmund in the return leg. It's a risky game though, as Reus, Götze and Co are still full of beans up front and looking dangerous on the counterattack.
bundesliga.com Reporter at the Signal Iduna Park: "Unbelievable! Unbelievable! Unbelievable! Now is not the time to ease off though. From the touchline Klopp is urging his players to stay calm and maintain their concentration."
67' GOAL! Who else but Lewandowski? The Pole is on fire tonight and rifles the ball straight down the middle. 4-1!
PENALTY TO DORTMUND:Reus is bundled over in the box by Alonso and the referee points straight to the spot.
61' An incredible run from Gündogan! The midfielder slinks his way past two opponents on the edge of the area and unleashes a rasping left-foot shot that is going in, but Lopez manages to tip over the bar.
bundesliga.com Reporter at the Signal Iduna Park: "What is going on here? There is a mega-party going on in the stands. It's what many had hoped for but what few really believed was possible. Mourinho and Real are visible stunned."
55' GOAL! Sensational! Sublime skill from Lewandowski. The box is crowded but the striker still has the presence of mind for a fleet-footed drag-back before smashing a fierce shot into the top corner beyond the helpless Lopez.
bundesliga.com Reporter at the Signal Iduna Park: "That was exactly what the Dortmund fans were signing about during half-time: 'Keep going'. They were paid back almost immediately"
50' GOAL!Lewandowski grabs his second of the evening to restore Dortmund's lead.
48' First corner of the game goes to Dortmund, but Reus' in-swinger from the left goes straight to keeper Lopez.
SECOND HALF: We're back underway in Dortmund. As it stands, a 1-1 draw would not be a terrible result for Klopp's troops, but an extra goal or two wouldn't hurt ahead of next week's return leg.
VOTE Why not spend the half-time break voting for your Bundesliga Team of the Season on our Fanzone page? There are plenty of players, including a few familiar Dortmund faces, to choose from and videos to help you make your decision. Get involved and cast your vote!
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HALF TIME: There appeared to be relatively little danger when a lofted ball over the top forced Hummels to turn tail, but the defender's mis-hit first-time back pass fell woefully short. Higuain easily intercepted, strode forward and squared the ball to Ronaldo for an easy finish.
HALF TIME: The sides go in level at the break. Dortmund will be kicking themselves after gifting Real an equaliser, but the visitors had not created much off their own backs prior to that.
43' GOAL!Ronaldo taps in from Higuain's pass after a terrible defensive error from Mats Hummels.
bundesliga.com Reporter at the Signal Iduna Park: "Real are getting stronger. The visiting fans are starting to find their voices and are waving their scarves. Dortmund appear to be a bit nervous. Klopp is becoming ever more vocal on the touchline."
36'Dortmund keep trying to find Lewandowski with swift balls forward to the Pole, looking to instigate another rapier-like attack. A Real defender is always at the right place at the right time to intercept at the moment though.
32' Terrific gas from Blaszczykowski down the right, skipping past two defenders. Real forward Gonazlo Higuain of all people tracks him back all the way to the six yard box before sliding in to clear.
30'Real are becoming increasingly more adventurous and Weidenfeller is having plenty more to do. Blaszczykowski and Piszczek are doubling up on Ronaldo every time he gets the ball.
bundesliga.com Reporter at the Signal Iduna Park: "Ronaldo didn't win any friends here with his free-kick stance. 'Here we like Pöhler (local street footballers), not posers' said former Dortmund player Lars Ricken."
26' The visitors are in the ascendancy at the moment and win another free-kick in a dangerous area. Xabi Alonso curls this one in from the left, but Subotic heads clear.
24'Real win a free-kick 30 yards out - perfect territory for Ronaldo. The Portuguese lines himself up in trademark fashion, but Weidenfeller is able to save.
19'Real are struggling to piece moves together in attack and are yet to test Roman Weidenfeller.
14'Dortmund are clearly on top at the moment, enjoying more possession and have looked the side most likely to find the net again. Reus is everywhere!
bundesliga.com Reporter at the Signal Iduna Park: "In the first few minutes Mourinho was standing on the edge of his technical area, pointing, gesticulating and shouting. Now we know why. It's 1-0 - Real are looking nervous."
8' GOAL!Götze curls in a sumptuous cross from the left wing, which finds Lewandowski at the back post to prod home.
7' What a run! Reus collects the ball on the half-way line and drives forward. He skips past three men and shoots, but Diego Lopez manages to save.
5'Reus turns on the after-burners and tries to launch a rapid attack, but he is outnumbered and loses the ball.
2' The match is still settling down, with the ball being won and lost frequently in midfield. Real are sitting deep in their own half whenever Dortmund get the ball.
KICK-OFF: And we're off! Real get the game underway and immediately look to attack down the left wing with Ronaldo.
Kick-off - 5 mins: Here they come! Dortmund's world famous Yellow Wall is as intimidating as ever as the teams line-up.
Kick-off - 15 mins: "I'm expecting Dortmund to attack, cover a lot of ground and fight for every ball. I feel no pressure and no fear. Those are foreign concepts to me," said the ever-confident Mourinho.
Kick-off - 19 mins: "There are no more secrets left to hide between these clubs anymore," said coach Jürgen Klopp. "Real are one of the best teams in the world and can play any type of football they want, but we've got several options up our sleeve too."
Kick-off - 23 mins: Bayer 04 Leverkusen defender Daniel Carvajal, a product of the Real Madrid youth academy, gave us his thoughts on the balance of power ahead of the tie.
Kick-off - 30 mins: Real Madrid coach Jose Mourinho was in Germany just a couple of weeks ago, scouting Dortmund in their match away to Greuther Fürth. You can see what Mr. Mourinho witnessed here.
Kick-off - 33 mins: The Dortmund players emerge from the tunnel for their warm-up to rapturous applause from the Signal Iduna PArk, which is swiftly filling up.
Kick-off - 37 mins:Dortmund have the best home record in the Champions League this season: five games, five wins, ten goals for, three against.
Kick-off - 40 mins:Ronaldo has played against German opposition five times, losing three of those games and drawing once.
Kick-off - 43 mins: Don't forget you can follow us on Twitter for all the latest news, reports, pictures and videos on all things Bundesliga.
Kick-off - 45 mins: The main danger man for Real is of course Cristiano Ronaldo. Check out our superb exclusive feature by Spanish football expert Paul Bryan on what Dortmund must do to survive.
Kick-off - 50 mins: The starting line-ups are in, and Götze is in the first XI!
Kick-off - 55 mins: And with good reason too, as the Yellow-Blacks have won their last five Bundesliga fixtures and also defeated Real 2-1 the last time they played here in the group stage.
Kick-off - 60 mins: The spectacular transfer coup involving Mario Götze joining rivals FC Bayern has dominted the pre-match build up, but Dortmund are confident of recording a decent result here tonight.
Kick-off - 80 mins:FC Bayern's fast-paced pressing and high defensive line worked a treat for them against Barcelona last night - will Dortmund adopt a similar tactic this evening?
Hello and welcome to bundesliga.com's LIVE coverage of tonight's UEFA Champions League semi-final first leg between Borussia Dortmund and Real Madrid C.F at the Signal Iduna Park. We'll be giving you your fill of all the live, text action including informative snippets from our in-stadium reporter.